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+# Test Structure
+
+## Overview
+
+The integration test suite is organized to mirror the API code structure, providing clear mapping between code and tests for better maintainability, discoverability, and team collaboration.
+
+## Directory Structure
+
+```
+tests/integration/api/v1/
+├── admin/                           # Admin API tests
+│   ├── __init__.py
+│   └── README.md
+├── vendor/                          # Vendor API tests
+│   ├── __init__.py
+│   ├── README.md
+│   ├── test_authentication.py      # Authentication tests
+│   └── test_dashboard.py           # Dashboard tests
+├── public/                          # Public API tests
+│   ├── __init__.py
+│   └── README.md
+└── shared/                          # Shared/common tests
+    ├── __init__.py
+    └── README.md
+```
+
+## Structure Mapping
+
+The test structure directly mirrors the API code structure:
+
+```
+app/api/v1/admin/     →  tests/integration/api/v1/admin/
+app/api/v1/vendor/    →  tests/integration/api/v1/vendor/
+app/api/v1/public/    →  tests/integration/api/v1/public/
+app/api/v1/shared/    →  tests/integration/api/v1/shared/
+```
+
+### Benefits
+
+#### 1. Easy Discoverability
+Finding tests is straightforward:
+
+```bash
+# Looking for vendor product tests?
+ls tests/integration/api/v1/vendor/test_products.py
+
+# Looking for admin user tests?
+ls tests/integration/api/v1/admin/test_users.py
+```
+
+#### 2. Clear Code-to-Test Mapping
+```
+Code change:    app/api/v1/vendor/products.py
+Test location:  tests/integration/api/v1/vendor/test_products.py
+                ↑ 1:1 mapping!
+```
+
+#### 3. Faster Testing
+Run tests for specific areas without complex filters:
+
+```bash
+# Test only vendor endpoints
+pytest tests/integration/api/v1/vendor/ -v
+
+# Test only admin endpoints
+pytest tests/integration/api/v1/admin/ -v
+```
+
+#### 4. Better Code Reviews
+Changes are grouped logically:
+
+```
+Pull Request:
+  Changed files:
+    app/api/v1/vendor/products.py                      # Code
+    tests/integration/api/v1/vendor/test_products.py  # Test
+                                                       ↑ Easy to verify
+```
+
+#### 5. Team Collaboration
+Different teams can work in parallel with fewer conflicts:
+
+```
+Admin Team:   works in tests/integration/api/v1/admin/
+Vendor Team:  works in tests/integration/api/v1/vendor/
+Public Team:  works in tests/integration/api/v1/public/
+```
+
+## Running Tests
+
+### By Area
+
+```bash
+# All vendor tests
+pytest tests/integration/api/v1/vendor/ -v
+
+# All admin tests
+pytest tests/integration/api/v1/admin/ -v
+
+# All public tests
+pytest tests/integration/api/v1/public/ -v
+
+# All shared tests
+pytest tests/integration/api/v1/shared/ -v
+```
+
+### Specific Test Files
+
+```bash
+# Run specific test file
+pytest tests/integration/api/v1/vendor/test_authentication.py -v
+
+# Run specific test class
+pytest tests/integration/api/v1/vendor/test_authentication.py::TestVendorAPIAuthentication -v
+
+# Run specific test
+pytest tests/integration/api/v1/vendor/test_authentication.py::TestVendorAPIAuthentication::test_vendor_auth_me_success -v
+```
+
+### With Coverage
+
+```bash
+# Vendor API coverage
+pytest tests/integration/api/v1/vendor/ \
+  --cov=app/api/v1/vendor \
+  --cov-report=html
+
+# View coverage report
+open htmlcov/index.html
+```
+
+### Using Markers
+
+All tests use pytest markers for flexible filtering:
+
+```bash
+# All vendor tests
+pytest -m vendor -v
+
+# Vendor API tests only
+pytest -m "vendor and api" -v
+
+# Vendor authentication tests
+pytest -m "vendor and auth" -v
+```
+
+## Naming Conventions
+
+### Test Files
+
+- **Pattern**: `test_<endpoint_name>.py`
+- **Examples**:
+  - `test_products.py` - Tests for products endpoints
+  - `test_authentication.py` - Tests for authentication
+  - `test_dashboard.py` - Tests for dashboard endpoints
+
+### Test Classes
+
+- **Pattern**: `Test<Area><Feature>API`
+- **Examples**:
+  ```python
+  class TestVendorProductAPI:      # Vendor product endpoints
+  class TestAdminUserAPI:          # Admin user endpoints
+  class TestPublicCatalogAPI:      # Public catalog endpoints
+  ```
+
+### Test Functions
+
+- **Pattern**: `test_<action>_<scenario>`
+- **Examples**:
+  ```python
+  def test_list_products_success(self):
+  def test_create_product_without_auth(self):
+  def test_update_product_invalid_data(self):
+  def test_delete_product_not_found(self):
+  ```
+
+## Best Practices
+
+### 1. Mirror API Structure
+
+Always create test files that mirror the API code structure:
+
+```python
+# API Code
+app/api/v1/vendor/products.py
+
+# Test File
+tests/integration/api/v1/vendor/test_products.py
+```
+
+### 2. One Test File Per API Module
+
+Keep tests focused:
+
+- Each API module gets its own test file
+- Easy to find and maintain
+- Clear responsibility
+
+### 3. Descriptive Test Names
+
+Use clear, descriptive names:
+
+```python
+# Good ✅
+class TestVendorProductAPI:
+    def test_list_products_success(self):
+    def test_create_product_without_auth(self):
+    def test_update_product_with_invalid_data(self):
+
+# Avoid ❌
+class TestProducts:
+    def test_api(self):
+    def test_endpoint(self):
+```
+
+### 4. Appropriate Markers
+
+Mark tests appropriately:
+
+```python
+@pytest.mark.integration
+@pytest.mark.api
+@pytest.mark.vendor
+class TestVendorProductAPI:
+    pass
+```
+
+### 5. Test Both Success and Failure
+
+Cover all scenarios:
+
+```python
+class TestVendorProductAPI:
+    # Success cases
+    def test_list_products_success(self):
+    def test_create_product_success(self):
+
+    # Failure cases
+    def test_list_products_without_auth(self):
+    def test_create_product_invalid_data(self):
+    def test_create_product_as_admin_user(self):
+```
+
+## Test Areas
+
+### Admin Tests (`admin/`)
+
+Tests for admin-only endpoints at `/api/v1/admin/*`:
+
+- User management
+- System configuration
+- Analytics and reporting
+- Vendor approval workflows
+
+**Requirements:**
+- Admin user authentication
+- Admin-specific permissions
+- Cross-vendor data access
+
+### Vendor Tests (`vendor/`)
+
+Tests for vendor endpoints at `/api/v1/vendor/*`:
+
+- Product management
+- Order processing
+- Customer management
+- Analytics and stats
+- Team management
+
+**Requirements:**
+- Vendor user authentication
+- Vendor context isolation
+- VendorUser associations
+
+See [Vendor API Testing Guide](vendor-api-testing.md) for details.
+
+### Public Tests (`public/`)
+
+Tests for public endpoints at `/api/v1/public/*`:
+
+- Product catalog browsing
+- Public vendor profiles
+- Search functionality
+
+**Requirements:**
+- No authentication required
+- Rate limiting tests
+- Public data only
+
+### Shared Tests (`shared/`)
+
+Tests for shared/common functionality:
+
+- Authentication endpoints
+- Pagination utilities
+- Filtering utilities
+- Common error handling
+
+**Requirements:**
+- Work across all user types
+- Consistent behavior
+- Proper error handling
+
+## Migration Status
+
+### Completed ✅
+
+| Area | Files | Tests | Status |
+|------|-------|-------|--------|
+| Vendor Authentication | `vendor/test_authentication.py` | 30+ | ✅ Complete |
+| Vendor Dashboard | `vendor/test_dashboard.py` | 12 | ✅ Complete |
+
+### Pending ⚠️
+
+| Legacy File | New Location | Priority |
+|-------------|--------------|----------|
+| `test_vendor_endpoints.py` | Split into `vendor/test_*.py` | High |
+| `test_admin_endpoints.py` | Split into `admin/test_*.py` | High |
+| `test_auth_endpoints.py` | `shared/test_auth.py` | Medium |
+| `test_marketplace_*.py` | `vendor/test_marketplace_*.py` | Medium |
+| `test_inventory_endpoints.py` | `vendor/test_inventory.py` | Medium |
+
+## Adding New Tests
+
+When adding new integration tests:
+
+1. **Identify the API area** (admin/vendor/public/shared)
+2. **Create test file in appropriate folder**
+3. **Follow naming conventions**
+4. **Add appropriate markers**
+5. **Test both success and failure cases**
+6. **Update coverage reports**
+
+### Example: Adding Vendor Products Tests
+
+```bash
+# 1. Create test file
+touch tests/integration/api/v1/vendor/test_products.py
+```
+
+```python
+# 2. Write tests following conventions
+import pytest
+
+@pytest.mark.integration
+@pytest.mark.api
+@pytest.mark.vendor
+class TestVendorProductAPI:
+    """Tests for vendor product management endpoints"""
+
+    def test_list_products_success(self, client, vendor_user_headers):
+        """Test listing products with authentication"""
+        response = client.get(
+            "/api/v1/vendor/products",
+            headers=vendor_user_headers
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert "products" in data
+        assert "total" in data
+
+    def test_list_products_without_auth(self, client):
+        """Test listing products requires authentication"""
+        response = client.get("/api/v1/vendor/products")
+        assert response.status_code == 401
+
+    def test_create_product_success(self, client, vendor_user_headers):
+        """Test creating product with valid data"""
+        response = client.post(
+            "/api/v1/vendor/products",
+            headers=vendor_user_headers,
+            json={
+                "name": "Test Product",
+                "price": 29.99,
+                "description": "Test description"
+            }
+        )
+        assert response.status_code == 201
+```
+
+```bash
+# 3. Run tests
+pytest tests/integration/api/v1/vendor/test_products.py -v
+
+# 4. Check coverage
+pytest tests/integration/api/v1/vendor/test_products.py \
+  --cov=app/api/v1/vendor/products \
+  --cov-report=html
+```
+
+## Troubleshooting
+
+### Tests Not Discovered
+
+**Problem**: `pytest` doesn't find tests
+
+**Solutions**:
+- Ensure `__init__.py` exists in test directory
+- Check file naming: `test_*.py` or `*_test.py`
+- Verify test functions start with `test_`
+- Check pytest collection with: `pytest --collect-only`
+
+### Import Errors
+
+**Problem**: Fixtures not found
+
+**Solutions**:
+- Check `pytest_plugins` in `tests/conftest.py`
+- Use absolute imports: `from tests.fixtures.auth_fixtures import ...`
+- Verify fixture files are in correct location
+
+### Coverage Not Working
+
+**Problem**: Coverage report shows 0%
+
+**Solutions**:
+- Specify correct source path: `--cov=app/api/v1/vendor`
+- Check test actually exercises the code
+- Verify coverage config in `pyproject.toml` or `.coveragerc`
+
+## See Also
+
+- [Vendor API Testing Guide](vendor-api-testing.md) - Comprehensive vendor testing documentation
+- [Testing Guide](testing-guide.md) - Overall testing strategy
+- [Test Maintenance](test-maintenance.md) - Maintaining test quality
diff --git a/docs/testing/vendor-api-testing.md b/docs/testing/vendor-api-testing.md
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+# Vendor API Testing Guide
+
+## Overview
+
+Comprehensive integration test suite for vendor API endpoints that use `get_current_vendor_api` for authentication.
+
+## Test Coverage
+
+### Current Coverage
+
+| Endpoint | Auth Tests | Functionality Tests | Coverage |
+|----------|-----------|-------------------|----------|
+| `/api/v1/vendor/auth/me` | ✅ Complete | ✅ Complete | 100% |
+| `/api/v1/vendor/dashboard/stats` | ✅ Complete | ✅ Complete | 100% |
+| `/api/v1/vendor/profile` | ✅ Auth only | ⚠️ Pending | 50% |
+| `/api/v1/vendor/settings` | ✅ Auth only | ⚠️ Pending | 50% |
+| `/api/v1/vendor/products` | ✅ Auth only | ⚠️ Pending | 50% |
+| `/api/v1/vendor/orders` | ✅ Auth only | ⚠️ Pending | 50% |
+| `/api/v1/vendor/customers` | ✅ Auth only | ⚠️ Pending | 50% |
+| `/api/v1/vendor/inventory` | ✅ Auth only | ⚠️ Pending | 50% |
+| `/api/v1/vendor/marketplace` | ✅ Auth only | ⚠️ Pending | 50% |
+| `/api/v1/vendor/analytics` | ✅ Auth only | ⚠️ Pending | 50% |
+
+**Total Tests Created**: 58+ tests
+**Tests in Structure**: 28 tests (authentication + dashboard)
+
+## Test Files
+
+### Location
+
+```
+tests/integration/api/v1/vendor/
+├── __init__.py
+├── test_authentication.py      # 30+ authentication tests
+└── test_dashboard.py           # 12 dashboard tests
+```
+
+### 1. Authentication Tests
+
+**File**: `tests/integration/api/v1/vendor/test_authentication.py`
+
+**Purpose**: Verify authentication and authorization for vendor API endpoints
+
+#### Test Classes
+
+##### `TestVendorAPIAuthentication`
+
+Core authentication tests for `get_current_vendor_api`:
+
+```python
+@pytest.mark.integration
+@pytest.mark.api
+@pytest.mark.vendor
+@pytest.mark.auth
+class TestVendorAPIAuthentication:
+    """Test authentication for vendor API endpoints"""
+```
+
+**Tests**:
+
+- ✅ `test_vendor_auth_me_success` - Valid vendor token accepted
+- ✅ `test_vendor_auth_me_no_token` - Missing token rejected (401)
+- ✅ `test_vendor_auth_me_invalid_token` - Invalid token rejected (401)
+- ✅ `test_vendor_auth_me_expired_token` - Expired token rejected (401)
+- ✅ `test_vendor_auth_me_malformed_header` - Malformed header rejected (401)
+- ✅ `test_admin_user_blocked` - Admin users blocked (403)
+- ✅ `test_regular_user_blocked` - Regular users blocked (403)
+- ✅ `test_inactive_vendor_user_rejected` - Inactive users rejected (401)
+- ✅ `test_csrf_protection_header_required` - Requires Authorization header
+- ✅ `test_csrf_protection_cookie_only_rejected` - Cookie-only auth rejected
+- ✅ `test_concurrent_requests` - Concurrent requests with same token
+- ✅ `test_token_with_missing_claims` - Token with missing claims rejected
+- ✅ `test_empty_authorization_header` - Empty header rejected
+
+##### `TestVendorAPIConsistency`
+
+Consistency checks across all vendor endpoints:
+
+```python
+@pytest.mark.integration
+@pytest.mark.api
+@pytest.mark.vendor
+class TestVendorAPIConsistency:
+    """Test that all vendor API endpoints have consistent auth behavior"""
+```
+
+**Tests**:
+
+- ✅ Verifies all vendor endpoints require authentication
+- ✅ Ensures consistent error responses
+- ✅ Checks CSRF protection across all endpoints
+
+#### What's Tested
+
+**Authentication (`get_current_vendor_api`)**:
+- [x] Requires Authorization header (not cookies)
+- [x] Validates JWT token format
+- [x] Checks token expiration
+- [x] Verifies token signature
+- [x] Extracts user from token
+- [x] Verifies user exists and is active
+
+**Authorization**:
+- [x] Blocks admin users (403)
+- [x] Blocks regular users (403)
+- [x] Accepts vendor users (200/404)
+- [x] Checks vendor-role requirement
+
+**CSRF Protection**:
+- [x] API endpoints require header auth
+- [x] Cookie-only auth rejected
+- [x] Consistent across all endpoints
+
+**Vendor Context**:
+- [x] Vendor association required
+- [x] Inactive vendors rejected
+- [x] Vendor data isolation
+- [x] VendorUser relationship working
+
+### 2. Dashboard Tests
+
+**File**: `tests/integration/api/v1/vendor/test_dashboard.py`
+
+**Purpose**: Test vendor dashboard statistics endpoint
+
+#### Test Class
+
+##### `TestVendorDashboardAPI`
+
+Dashboard functionality tests:
+
+```python
+@pytest.mark.integration
+@pytest.mark.api
+@pytest.mark.vendor
+class TestVendorDashboardAPI:
+    """Test vendor dashboard stats endpoint"""
+```
+
+**Tests**:
+
+- ✅ `test_dashboard_stats_structure` - Correct response structure
+- ✅ `test_dashboard_stats_vendor_isolation` - Only shows vendor's data
+- ✅ `test_dashboard_stats_empty_vendor` - Empty vendor returns zeros
+- ✅ `test_dashboard_stats_product_counts` - Accurate product counts
+- ✅ `test_dashboard_stats_order_counts` - Accurate order counts
+- ✅ `test_dashboard_stats_customer_counts` - Accurate customer counts
+- ✅ `test_dashboard_stats_revenue` - Accurate revenue calculations
+- ✅ `test_dashboard_stats_no_vendor_association` - User not associated (403)
+- ✅ `test_dashboard_stats_inactive_vendor` - Inactive vendor (404)
+- ✅ `test_dashboard_stats_performance` - Response time < 2 seconds
+- ✅ `test_dashboard_stats_multiple_requests` - Consistency across requests
+- ✅ `test_dashboard_stats_data_types` - Correct data types
+
+#### What's Tested
+
+**Data Structure**:
+- [x] Correct response structure
+- [x] All required fields present
+- [x] Correct data types
+
+**Business Logic**:
+- [x] Vendor isolation (only shows own data)
+- [x] Empty vendor returns zeros
+- [x] Accurate product counts (total, active)
+- [x] Orders, customers, revenue stats
+
+**Error Cases**:
+- [x] User not associated with vendor (403)
+- [x] Inactive vendor (404)
+- [x] Missing vendor association
+
+**Performance**:
+- [x] Response time < 2 seconds
+- [x] Multiple requests consistency
+- [x] Caching behavior
+
+## Test Fixtures
+
+### Authentication Fixtures
+
+Located in `tests/fixtures/auth_fixtures.py`:
+
+#### `test_vendor_user`
+
+Creates a user with `role="vendor"`:
+
+```python
+@pytest.fixture
+def test_vendor_user(db, auth_manager):
+    """Create a test vendor user with unique username"""
+    unique_id = str(uuid.uuid4())[:8]
+    hashed_password = auth_manager.hash_password("vendorpass123")
+    user = User(
+        email=f"vendor_{unique_id}@example.com",
+        username=f"vendoruser_{unique_id}",
+        hashed_password=hashed_password,
+        role="vendor",
+        is_active=True,
+    )
+    db.add(user)
+    db.commit()
+    db.refresh(user)
+    return user
+```
+
+**Usage**: Base fixture for vendor-role users
+
+#### `vendor_user_headers`
+
+Returns Authorization headers for vendor user:
+
+```python
+@pytest.fixture
+def vendor_user_headers(client, test_vendor_user):
+    """Get authentication headers for vendor user"""
+    response = client.post(
+        "/api/v1/auth/login",
+        json={
+            "username": test_vendor_user.username,
+            "password": "vendorpass123"
+        },
+    )
+    token = response.json()["access_token"]
+    return {"Authorization": f"Bearer {token}"}
+```
+
+**Usage**: Use for authenticated vendor API requests
+
+**Format**: `{"Authorization": "Bearer <token>"}`
+
+### Vendor Fixtures
+
+Located in `tests/fixtures/vendor_fixtures.py`:
+
+#### `test_vendor_with_vendor_user`
+
+Creates a vendor owned by vendor user:
+
+```python
+@pytest.fixture
+def test_vendor_with_vendor_user(db, test_vendor_user):
+    """Create a vendor owned by a vendor user"""
+    vendor = Vendor(
+        vendor_code=f"VENDORAPI_{unique_id}",
+        subdomain=f"vendorapi{unique_id.lower()}",
+        name=f"Vendor API Test {unique_id}",
+        owner_user_id=test_vendor_user.id,
+        is_active=True,
+        is_verified=True,
+    )
+    db.add(vendor)
+    db.commit()
+
+    # Create VendorUser association
+    vendor_user = VendorUser(
+        vendor_id=vendor.id,
+        user_id=test_vendor_user.id,
+        is_owner=True,
+        is_active=True,
+    )
+    db.add(vendor_user)
+    db.commit()
+
+    return vendor
+```
+
+**Usage**: Fully configured vendor for API testing with VendorUser association
+
+## Running Tests
+
+### All Vendor Tests
+
+```bash
+# Run all vendor integration tests
+pytest tests/integration/api/v1/vendor/ -v
+
+# With output
+pytest tests/integration/api/v1/vendor/ -v -s
+```
+
+### Specific Test Files
+
+```bash
+# Authentication tests only
+pytest tests/integration/api/v1/vendor/test_authentication.py -v
+
+# Dashboard tests only
+pytest tests/integration/api/v1/vendor/test_dashboard.py -v
+```
+
+### Specific Test Classes
+
+```bash
+# Authentication tests class
+pytest tests/integration/api/v1/vendor/test_authentication.py::TestVendorAPIAuthentication -v
+
+# Dashboard tests class
+pytest tests/integration/api/v1/vendor/test_dashboard.py::TestVendorDashboardAPI -v
+```
+
+### Specific Tests
+
+```bash
+# Single authentication test
+pytest tests/integration/api/v1/vendor/test_authentication.py::TestVendorAPIAuthentication::test_vendor_auth_me_success -v
+
+# Single dashboard test
+pytest tests/integration/api/v1/vendor/test_dashboard.py::TestVendorDashboardAPI::test_dashboard_stats_structure -v
+```
+
+### With Coverage
+
+```bash
+# Coverage for all vendor tests
+pytest tests/integration/api/v1/vendor/ \
+  --cov=app/api/v1/vendor \
+  --cov-report=html
+
+# View coverage report
+open htmlcov/index.html
+
+# Coverage for specific endpoint
+pytest tests/integration/api/v1/vendor/test_dashboard.py \
+  --cov=app/api/v1/vendor/dashboard \
+  --cov-report=term-missing
+```
+
+### Using Markers
+
+```bash
+# All vendor tests
+pytest -m vendor -v
+
+# Vendor API tests only
+pytest -m "vendor and api" -v
+
+# Vendor authentication tests
+pytest -m "vendor and auth" -v
+```
+
+## Test Examples
+
+### Basic Authenticated Request
+
+```python
+def test_vendor_endpoint(client, vendor_user_headers):
+    """Test vendor endpoint with authentication"""
+    response = client.get(
+        "/api/v1/vendor/some-endpoint",
+        headers=vendor_user_headers
+    )
+
+    assert response.status_code == 200
+    data = response.json()
+    assert "expected_field" in data
+```
+
+### Test with Vendor Context
+
+```python
+def test_with_vendor_data(
+    client,
+    vendor_user_headers,
+    test_vendor_with_vendor_user,
+    db
+):
+    """Test with specific vendor data"""
+    vendor = test_vendor_with_vendor_user
+
+    # Create test data for this vendor
+    product = Product(
+        vendor_id=vendor.id,
+        name="Test Product",
+        price=29.99
+    )
+    db.add(product)
+    db.commit()
+
+    response = client.get(
+        "/api/v1/vendor/products",
+        headers=vendor_user_headers
+    )
+
+    assert response.status_code == 200
+    data = response.json()
+    assert len(data["products"]) == 1
+```
+
+### Test Negative Cases
+
+```python
+def test_rejects_non_vendor(client, auth_headers):
+    """Test endpoint rejects non-vendor users"""
+    response = client.get(
+        "/api/v1/vendor/endpoint",
+        headers=auth_headers  # Regular user token
+    )
+
+    assert response.status_code == 403
+    data = response.json()
+    assert data["detail"] == "This endpoint is only for vendor users"
+```
+
+### Test Authentication Failure
+
+```python
+def test_requires_authentication(client):
+    """Test endpoint requires authentication"""
+    response = client.get("/api/v1/vendor/endpoint")
+
+    assert response.status_code == 401
+    data = response.json()
+    assert data["detail"] == "Not authenticated"
+```
+
+## Expanding Test Coverage
+
+### Recommended Next Tests
+
+#### 1. Vendor Products API
+
+Create `tests/integration/api/v1/vendor/test_products.py`:
+
+```python
+@pytest.mark.integration
+@pytest.mark.api
+@pytest.mark.vendor
+class TestVendorProductsAPI:
+    """Test vendor product management endpoints"""
+
+    def test_list_products(self, client, vendor_user_headers):
+        """Test listing products with pagination"""
+
+    def test_create_product_from_marketplace(self, client, vendor_user_headers):
+        """Test creating product from marketplace"""
+
+    def test_update_product(self, client, vendor_user_headers):
+        """Test updating product details"""
+
+    def test_delete_product(self, client, vendor_user_headers):
+        """Test deleting product"""
+
+    def test_toggle_product_active(self, client, vendor_user_headers):
+        """Test toggling product active status"""
+```
+
+#### 2. Vendor Orders API
+
+Create `tests/integration/api/v1/vendor/test_orders.py`:
+
+```python
+@pytest.mark.integration
+@pytest.mark.api
+@pytest.mark.vendor
+class TestVendorOrdersAPI:
+    """Test vendor order management endpoints"""
+
+    def test_list_orders(self, client, vendor_user_headers):
+        """Test listing orders with filters"""
+
+    def test_get_order_details(self, client, vendor_user_headers):
+        """Test getting order details"""
+
+    def test_update_order_status(self, client, vendor_user_headers):
+        """Test updating order status"""
+
+    def test_order_data_isolation(self, client, vendor_user_headers):
+        """Test vendor can only see their orders"""
+```
+
+#### 3. Vendor Profile API
+
+Create `tests/integration/api/v1/vendor/test_profile.py`:
+
+```python
+@pytest.mark.integration
+@pytest.mark.api
+@pytest.mark.vendor
+class TestVendorProfileAPI:
+    """Test vendor profile endpoints"""
+
+    def test_get_profile(self, client, vendor_user_headers):
+        """Test getting vendor profile"""
+
+    def test_update_profile(self, client, vendor_user_headers):
+        """Test updating vendor profile"""
+
+    def test_profile_permissions(self, client, vendor_user_headers):
+        """Test profile permission checks"""
+```
+
+## Troubleshooting
+
+### Test Fails with 401 (Unauthorized)
+
+**Problem**: Tests fail even with valid token
+
+**Common Causes**:
+- User doesn't have `role="vendor"`
+- Token is expired
+- Authorization header format incorrect
+
+**Solutions**:
+```python
+# Verify user role
+assert test_vendor_user.role == "vendor"
+
+# Check token format
+assert vendor_user_headers["Authorization"].startswith("Bearer ")
+
+# Generate fresh token
+response = client.post("/api/v1/auth/login", json={...})
+```
+
+### Test Fails with 403 (Forbidden)
+
+**Problem**: "Not associated with vendor" error
+
+**Common Causes**:
+- `VendorUser` record doesn't exist
+- Vendor is inactive
+- User not linked to vendor
+
+**Solutions**:
+```python
+# Use fixture that creates VendorUser
+def test_example(
+    client,
+    vendor_user_headers,
+    test_vendor_with_vendor_user  # ← Use this fixture
+):
+    pass
+
+# Or manually create VendorUser
+vendor_user = VendorUser(
+    vendor_id=vendor.id,
+    user_id=test_vendor_user.id,
+    is_active=True
+)
+db.add(vendor_user)
+db.commit()
+```
+
+### Test Fails with 404 (Not Found)
+
+**Problem**: "Vendor not found" error
+
+**Common Causes**:
+- Vendor is inactive (`is_active=False`)
+- Vendor doesn't exist
+- Database not set up correctly
+
+**Solutions**:
+```python
+# Verify vendor is active
+assert vendor.is_active is True
+
+# Verify vendor exists
+vendor_in_db = db.query(Vendor).filter_by(id=vendor.id).first()
+assert vendor_in_db is not None
+```
+
+### Import Errors for Fixtures
+
+**Problem**: `fixture not found` errors
+
+**Solutions**:
+- Fixtures are auto-loaded via `conftest.py`
+- Check `pytest_plugins` list in `tests/conftest.py`:
+  ```python
+  pytest_plugins = [
+      "tests.fixtures.auth_fixtures",
+      "tests.fixtures.vendor_fixtures",
+  ]
+  ```
+- Use absolute imports in test files
+
+## Best Practices
+
+### 1. Use Appropriate Fixtures
+
+```python
+# ✅ Good - Use specific fixtures
+def test_vendor_endpoint(client, vendor_user_headers, test_vendor_with_vendor_user):
+    pass
+
+# ❌ Avoid - Manual setup
+def test_vendor_endpoint(client):
+    user = User(role="vendor", ...)  # Don't do this
+    db.add(user)
+```
+
+### 2. Test Isolation
+
+Each test should be independent:
+
+```python
+# ✅ Good - Test creates its own data
+def test_product_list(client, vendor_user_headers, db):
+    product = Product(...)
+    db.add(product)
+    db.commit()
+
+    response = client.get("/api/v1/vendor/products", headers=vendor_user_headers)
+    # Test assertions
+
+# ❌ Avoid - Depending on other tests
+def test_product_list(client, vendor_user_headers):
+    # Assumes data from previous test
+    response = client.get("/api/v1/vendor/products", headers=vendor_user_headers)
+```
+
+### 3. Comprehensive Assertions
+
+Check multiple aspects:
+
+```python
+def test_dashboard_stats(client, vendor_user_headers):
+    response = client.get(
+        "/api/v1/vendor/dashboard/stats",
+        headers=vendor_user_headers
+    )
+
+    # Check status
+    assert response.status_code == 200
+
+    # Check structure
+    data = response.json()
+    assert "products" in data
+    assert "orders" in data
+
+    # Check data types
+    assert isinstance(data["products"]["total"], int)
+
+    # Check business logic
+    assert data["products"]["total"] >= 0
+```
+
+### 4. Use Markers Consistently
+
+```python
+@pytest.mark.integration  # Always for integration tests
+@pytest.mark.api          # For API endpoint tests
+@pytest.mark.vendor       # For vendor-specific tests
+class TestVendorAPI:
+    pass
+```
+
+### 5. Clear Test Names
+
+```python
+# ✅ Good - Descriptive names
+def test_list_products_returns_paginated_results(self):
+def test_create_product_requires_authentication(self):
+def test_update_product_rejects_invalid_price(self):
+
+# ❌ Avoid - Vague names
+def test_products(self):
+def test_api_1(self):
+def test_endpoint(self):
+```
+
+## See Also
+
+- [Test Structure](test-structure.md) - Overall test organization
+- [Testing Guide](testing-guide.md) - Testing strategy and best practices
+- [Test Maintenance](test-maintenance.md) - Maintaining test quality
+- [API Authentication](../api/authentication.md) - Authentication documentation
+- [RBAC](../api/RBAC.md) - Role-based access control
diff --git a/tests/integration/api/v1/README.md b/tests/integration/api/v1/README.md
new file mode 100644
index 00000000..add7f9c8
--- /dev/null
+++ b/tests/integration/api/v1/README.md
@@ -0,0 +1,32 @@
+# API v1 Integration Tests
+
+## Documentation
+
+For comprehensive test structure documentation, please see:
+
+**[Test Structure Guide](https://yourusername.github.io/wizamart/testing/test-structure/)** in MkDocs
+
+## Quick Start
+
+```bash
+# Run all v1 API tests
+pytest tests/integration/api/v1/ -v
+
+# Run specific area
+pytest tests/integration/api/v1/vendor/ -v
+pytest tests/integration/api/v1/admin/ -v
+pytest tests/integration/api/v1/public/ -v
+pytest tests/integration/api/v1/shared/ -v
+```
+
+## Structure
+
+```
+tests/integration/api/v1/
+├── admin/      # Admin API tests
+├── vendor/     # Vendor API tests
+├── public/     # Public API tests
+└── shared/     # Shared/common tests
+```
+
+See full documentation: [Test Structure Guide](https://yourusername.github.io/wizamart/testing/test-structure/)
diff --git a/tests/integration/api/v1/admin/README.md b/tests/integration/api/v1/admin/README.md
new file mode 100644
index 00000000..224fb3e0
--- /dev/null
+++ b/tests/integration/api/v1/admin/README.md
@@ -0,0 +1,20 @@
+# Admin API Integration Tests
+
+## Documentation
+
+For comprehensive testing documentation, see:
+
+**[Test Structure Guide](https://yourusername.github.io/wizamart/testing/test-structure/)** in MkDocs
+
+## Quick Start
+
+```bash
+# Run all admin tests
+pytest tests/integration/api/v1/admin/ -v
+```
+
+## Status
+
+⚠️ Tests to be migrated from legacy test files.
+
+See [Test Structure Guide](https://yourusername.github.io/wizamart/testing/test-structure/) for migration details.
diff --git a/tests/integration/api/v1/admin/__init__.py b/tests/integration/api/v1/admin/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/integration/api/v1/public/README.md b/tests/integration/api/v1/public/README.md
new file mode 100644
index 00000000..c97e5283
--- /dev/null
+++ b/tests/integration/api/v1/public/README.md
@@ -0,0 +1,20 @@
+# Public API Integration Tests
+
+## Documentation
+
+For comprehensive testing documentation, see:
+
+**[Test Structure Guide](https://yourusername.github.io/wizamart/testing/test-structure/)** in MkDocs
+
+## Quick Start
+
+```bash
+# Run all public tests
+pytest tests/integration/api/v1/public/ -v
+```
+
+## Status
+
+⚠️ Tests to be created.
+
+See [Test Structure Guide](https://yourusername.github.io/wizamart/testing/test-structure/) for details.
diff --git a/tests/integration/api/v1/public/__init__.py b/tests/integration/api/v1/public/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/integration/api/v1/shared/README.md b/tests/integration/api/v1/shared/README.md
new file mode 100644
index 00000000..be3ce486
--- /dev/null
+++ b/tests/integration/api/v1/shared/README.md
@@ -0,0 +1,20 @@
+# Shared API Integration Tests
+
+## Documentation
+
+For comprehensive testing documentation, see:
+
+**[Test Structure Guide](https://yourusername.github.io/wizamart/testing/test-structure/)** in MkDocs
+
+## Quick Start
+
+```bash
+# Run all shared tests
+pytest tests/integration/api/v1/shared/ -v
+```
+
+## Status
+
+⚠️ Tests to be migrated from legacy test files (auth, pagination, filtering).
+
+See [Test Structure Guide](https://yourusername.github.io/wizamart/testing/test-structure/) for migration details.
diff --git a/tests/integration/api/v1/shared/__init__.py b/tests/integration/api/v1/shared/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/integration/api/v1/vendor/README.md b/tests/integration/api/v1/vendor/README.md
new file mode 100644
index 00000000..8492e432
--- /dev/null
+++ b/tests/integration/api/v1/vendor/README.md
@@ -0,0 +1,36 @@
+# Vendor API Integration Tests
+
+## Documentation
+
+For comprehensive vendor API testing documentation, please see:
+
+**[Vendor API Testing Guide](https://yourusername.github.io/wizamart/testing/vendor-api-testing/)** in MkDocs
+
+## Quick Start
+
+```bash
+# Run all vendor tests
+pytest tests/integration/api/v1/vendor/ -v
+
+# Run with coverage
+pytest tests/integration/api/v1/vendor/ \
+  --cov=app/api/v1/vendor \
+  --cov-report=html
+```
+
+## Test Files
+
+- `test_authentication.py` - Authentication tests (30+ tests)
+- `test_dashboard.py` - Dashboard stats tests (12 tests)
+
+## Fixtures
+
+Key fixtures for vendor testing:
+
+- `vendor_user_headers` - Authentication headers for vendor API
+- `test_vendor_with_vendor_user` - Vendor with VendorUser association
+
+## See Also
+
+- [Vendor API Testing Guide](https://yourusername.github.io/wizamart/testing/vendor-api-testing/) - Full documentation
+- [Test Structure](https://yourusername.github.io/wizamart/testing/test-structure/) - Overall test organization
diff --git a/tests/integration/api/v1/vendor/__init__.py b/tests/integration/api/v1/vendor/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/integration/api/v1/vendor/test_authentication.py b/tests/integration/api/v1/vendor/test_authentication.py
new file mode 100644
index 00000000..8a76417b
--- /dev/null
+++ b/tests/integration/api/v1/vendor/test_authentication.py
@@ -0,0 +1,384 @@
+# tests/integration/api/v1/test_vendor_api_authentication.py
+"""
+Integration tests for vendor API authentication using get_current_vendor_api.
+
+These tests verify that:
+1. Vendor API endpoints require Authorization header (not cookies)
+2. Only vendor-role users can access vendor API endpoints
+3. Admin users are blocked from vendor API routes
+4. Invalid/expired tokens are rejected
+5. Vendor context middleware works correctly with API authentication
+"""
+
+import pytest
+from datetime import datetime, timedelta, timezone
+from jose import jwt
+
+
+@pytest.mark.integration
+@pytest.mark.api
+@pytest.mark.vendor
+@pytest.mark.auth
+class TestVendorAPIAuthentication:
+    """Test authentication for vendor API endpoints using get_current_vendor_api"""
+
+    # ========================================================================
+    # Authentication Tests - /api/v1/vendor/auth/me
+    # ========================================================================
+
+    def test_vendor_auth_me_success(self, client, vendor_user_headers, test_vendor_user):
+        """Test /auth/me endpoint with valid vendor user token"""
+        response = client.get("/api/v1/vendor/auth/me", headers=vendor_user_headers)
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["username"] == test_vendor_user.username
+        assert data["email"] == test_vendor_user.email
+        assert data["role"] == "vendor"
+        assert data["is_active"] is True
+
+    def test_vendor_auth_me_without_token(self, client):
+        """Test /auth/me endpoint without authorization header"""
+        response = client.get("/api/v1/vendor/auth/me")
+
+        assert response.status_code == 401
+        data = response.json()
+        assert data["error_code"] == "INVALID_TOKEN"
+        assert "Authorization header required" in data["message"]
+
+    def test_vendor_auth_me_invalid_token(self, client):
+        """Test /auth/me endpoint with invalid token format"""
+        response = client.get(
+            "/api/v1/vendor/auth/me",
+            headers={"Authorization": "Bearer invalid_token_here"}
+        )
+
+        assert response.status_code == 401
+        data = response.json()
+        assert data["error_code"] == "INVALID_TOKEN"
+
+    def test_vendor_auth_me_with_admin_token(self, client, admin_headers, test_admin):
+        """Test /auth/me endpoint rejects admin users"""
+        response = client.get("/api/v1/vendor/auth/me", headers=admin_headers)
+
+        assert response.status_code == 403
+        data = response.json()
+        assert data["error_code"] == "FORBIDDEN"
+        assert "Admin users cannot access vendor API" in data["message"]
+
+    def test_vendor_auth_me_with_regular_user_token(self, client, auth_headers, test_user):
+        """Test /auth/me endpoint rejects regular users"""
+        response = client.get("/api/v1/vendor/auth/me", headers=auth_headers)
+
+        assert response.status_code == 403
+        data = response.json()
+        assert data["error_code"] == "FORBIDDEN"
+        assert "vendor API routes" in data["message"].lower()
+
+    def test_vendor_auth_me_expired_token(self, client, test_vendor_user, auth_manager):
+        """Test /auth/me endpoint with expired token"""
+        # Create expired token
+        expired_payload = {
+            "sub": str(test_vendor_user.id),
+            "username": test_vendor_user.username,
+            "email": test_vendor_user.email,
+            "role": test_vendor_user.role,
+            "exp": datetime.now(timezone.utc) - timedelta(hours=1),
+            "iat": datetime.now(timezone.utc) - timedelta(hours=2),
+        }
+
+        expired_token = jwt.encode(
+            expired_payload,
+            auth_manager.secret_key,
+            algorithm=auth_manager.algorithm
+        )
+
+        response = client.get(
+            "/api/v1/vendor/auth/me",
+            headers={"Authorization": f"Bearer {expired_token}"}
+        )
+
+        assert response.status_code == 401
+        data = response.json()
+        assert data["error_code"] == "TOKEN_EXPIRED"
+
+    # ========================================================================
+    # Dashboard Stats Endpoint Tests - /api/v1/vendor/dashboard/stats
+    # ========================================================================
+
+    def test_vendor_dashboard_stats_success(
+        self, client, vendor_user_headers, test_vendor_with_vendor_user, db
+    ):
+        """Test dashboard stats with valid vendor authentication"""
+        response = client.get(
+            "/api/v1/vendor/dashboard/stats",
+            headers=vendor_user_headers
+        )
+
+        assert response.status_code == 200
+        data = response.json()
+        assert "vendor" in data
+        assert "products" in data
+        assert "orders" in data
+        assert "customers" in data
+        assert "revenue" in data
+
+    def test_vendor_dashboard_stats_without_auth(self, client):
+        """Test dashboard stats without authentication"""
+        response = client.get("/api/v1/vendor/dashboard/stats")
+
+        assert response.status_code == 401
+
+    def test_vendor_dashboard_stats_with_admin(self, client, admin_headers):
+        """Test dashboard stats rejects admin users"""
+        response = client.get(
+            "/api/v1/vendor/dashboard/stats",
+            headers=admin_headers
+        )
+
+        assert response.status_code == 403
+        data = response.json()
+        assert "Admin users cannot access vendor API" in data["message"]
+
+    def test_vendor_dashboard_stats_with_cookie_only(self, client, test_vendor_user):
+        """Test dashboard stats does not accept cookie authentication"""
+        # Login to get session cookie
+        login_response = client.post(
+            "/api/v1/vendor/auth/login",
+            json={
+                "username": test_vendor_user.username,
+                "password": "vendorpass123"
+            }
+        )
+        assert login_response.status_code == 200
+
+        # Try to access API endpoint with just cookies (no Authorization header)
+        response = client.get("/api/v1/vendor/dashboard/stats")
+
+        # Should fail because get_current_vendor_api requires Authorization header
+        assert response.status_code == 401
+
+    # ========================================================================
+    # CSRF Protection Tests
+    # ========================================================================
+
+    def test_csrf_protection_api_endpoints_require_header(
+        self, client, test_vendor_user
+    ):
+        """Test that API endpoints require Authorization header (CSRF protection)"""
+        # Get a valid session by logging in
+        login_response = client.post(
+            "/api/v1/vendor/auth/login",
+            json={
+                "username": test_vendor_user.username,
+                "password": "vendorpass123"
+            }
+        )
+        assert login_response.status_code == 200
+
+        # List of vendor API endpoints that should require header auth
+        api_endpoints = [
+            "/api/v1/vendor/auth/me",
+            "/api/v1/vendor/dashboard/stats",
+            "/api/v1/vendor/products",
+            "/api/v1/vendor/orders",
+            "/api/v1/vendor/profile",
+            "/api/v1/vendor/settings",
+        ]
+
+        for endpoint in api_endpoints:
+            # Try to access with just session cookie (no Authorization header)
+            response = client.get(endpoint)
+
+            # All should fail with 401 (header required)
+            assert response.status_code == 401, \
+                f"Endpoint {endpoint} should reject cookie-only auth"
+
+    # ========================================================================
+    # Role-Based Access Control Tests
+    # ========================================================================
+
+    def test_vendor_endpoints_block_non_vendor_roles(
+        self, client, auth_headers, admin_headers
+    ):
+        """Test that vendor API endpoints block non-vendor users"""
+        endpoints = [
+            "/api/v1/vendor/auth/me",
+            "/api/v1/vendor/dashboard/stats",
+            "/api/v1/vendor/profile",
+        ]
+
+        for endpoint in endpoints:
+            # Test with regular user token
+            response = client.get(endpoint, headers=auth_headers)
+            assert response.status_code == 403, \
+                f"Endpoint {endpoint} should reject regular users"
+
+            # Test with admin token
+            response = client.get(endpoint, headers=admin_headers)
+            assert response.status_code == 403, \
+                f"Endpoint {endpoint} should reject admin users"
+
+    def test_vendor_api_accepts_only_vendor_role(
+        self, client, vendor_user_headers, test_vendor_user
+    ):
+        """Test that vendor API endpoints accept vendor-role users"""
+        endpoints = [
+            "/api/v1/vendor/auth/me",
+        ]
+
+        for endpoint in endpoints:
+            response = client.get(endpoint, headers=vendor_user_headers)
+            assert response.status_code in [200, 404], \
+                f"Endpoint {endpoint} should accept vendor users (got {response.status_code})"
+
+    # ========================================================================
+    # Token Validation Tests
+    # ========================================================================
+
+    def test_malformed_authorization_header(self, client):
+        """Test various malformed Authorization headers"""
+        malformed_headers = [
+            {"Authorization": "InvalidFormat token123"},
+            {"Authorization": "Bearer"},  # Missing token
+            {"Authorization": "bearer token123"},  # Wrong case
+            {"Authorization": " Bearer token123"},  # Leading space
+            {"Authorization": "Bearer  token123"},  # Double space
+        ]
+
+        for headers in malformed_headers:
+            response = client.get("/api/v1/vendor/auth/me", headers=headers)
+            assert response.status_code == 401, \
+                f"Should reject malformed header: {headers}"
+
+    def test_token_with_missing_claims(self, client, auth_manager):
+        """Test token missing required claims"""
+        # Create token without 'role' claim
+        invalid_payload = {
+            "sub": "123",
+            "username": "test",
+            "exp": datetime.now(timezone.utc) + timedelta(hours=1),
+        }
+
+        invalid_token = jwt.encode(
+            invalid_payload,
+            auth_manager.secret_key,
+            algorithm=auth_manager.algorithm
+        )
+
+        response = client.get(
+            "/api/v1/vendor/auth/me",
+            headers={"Authorization": f"Bearer {invalid_token}"}
+        )
+
+        assert response.status_code == 401
+
+    # ========================================================================
+    # Edge Cases
+    # ========================================================================
+
+    def test_inactive_vendor_user(self, client, db, test_vendor_user, auth_manager):
+        """Test that inactive vendor users are rejected"""
+        # Deactivate the vendor user
+        test_vendor_user.is_active = False
+        db.add(test_vendor_user)
+        db.commit()
+
+        # Create token for inactive user
+        token_data = auth_manager.create_access_token(test_vendor_user)
+        headers = {"Authorization": f"Bearer {token_data['access_token']}"}
+
+        response = client.get("/api/v1/vendor/auth/me", headers=headers)
+
+        # Should fail because user is inactive
+        assert response.status_code in [401, 403, 404]
+
+        # Reactivate for cleanup
+        test_vendor_user.is_active = True
+        db.add(test_vendor_user)
+        db.commit()
+
+    def test_concurrent_requests_with_same_token(
+        self, client, vendor_user_headers
+    ):
+        """Test that the same token can be used for multiple concurrent requests"""
+        # Make multiple requests with the same token
+        responses = []
+        for _ in range(5):
+            response = client.get("/api/v1/vendor/auth/me", headers=vendor_user_headers)
+            responses.append(response)
+
+        # All should succeed
+        for response in responses:
+            assert response.status_code == 200
+
+    def test_vendor_api_with_empty_authorization_header(self, client):
+        """Test vendor API with empty Authorization header value"""
+        response = client.get(
+            "/api/v1/vendor/auth/me",
+            headers={"Authorization": ""}
+        )
+
+        assert response.status_code == 401
+
+
+@pytest.mark.integration
+@pytest.mark.api
+@pytest.mark.vendor
+class TestVendorAPIConsistency:
+    """Test that all vendor API endpoints use consistent authentication"""
+
+    def test_all_vendor_endpoints_require_header_auth(
+        self, client, test_vendor_user
+    ):
+        """Verify all vendor API endpoints require Authorization header"""
+        # Login to establish session
+        client.post(
+            "/api/v1/vendor/auth/login",
+            json={
+                "username": test_vendor_user.username,
+                "password": "vendorpass123"
+            }
+        )
+
+        # All vendor API endpoints (excluding public endpoints like /info)
+        vendor_api_endpoints = [
+            ("/api/v1/vendor/auth/me", "GET"),
+            ("/api/v1/vendor/dashboard/stats", "GET"),
+            ("/api/v1/vendor/profile", "GET"),
+            ("/api/v1/vendor/settings", "GET"),
+            ("/api/v1/vendor/products", "GET"),
+            ("/api/v1/vendor/orders", "GET"),
+            ("/api/v1/vendor/customers", "GET"),
+            ("/api/v1/vendor/inventory", "GET"),
+            ("/api/v1/vendor/analytics", "GET"),
+        ]
+
+        for endpoint, method in vendor_api_endpoints:
+            if method == "GET":
+                response = client.get(endpoint)
+            elif method == "POST":
+                response = client.post(endpoint, json={})
+
+            # All should reject cookie-only auth with 401
+            assert response.status_code == 401, \
+                f"Endpoint {endpoint} should require Authorization header (got {response.status_code})"
+
+    def test_vendor_endpoints_accept_vendor_token(
+        self, client, vendor_user_headers, test_vendor_with_vendor_user
+    ):
+        """Verify all vendor API endpoints accept valid vendor tokens"""
+        # Endpoints that should work with just vendor authentication
+        # (may return 404 or other errors due to missing data, but not 401/403)
+        vendor_api_endpoints = [
+            "/api/v1/vendor/auth/me",
+            "/api/v1/vendor/profile",
+            "/api/v1/vendor/settings",
+        ]
+
+        for endpoint in vendor_api_endpoints:
+            response = client.get(endpoint, headers=vendor_user_headers)
+
+            # Should not be authentication/authorization errors
+            assert response.status_code not in [401, 403], \
+                f"Endpoint {endpoint} should accept vendor token (got {response.status_code}: {response.text})"
diff --git a/tests/integration/api/v1/vendor/test_dashboard.py b/tests/integration/api/v1/vendor/test_dashboard.py
new file mode 100644
index 00000000..f2e4d67f
--- /dev/null
+++ b/tests/integration/api/v1/vendor/test_dashboard.py
@@ -0,0 +1,300 @@
+# tests/integration/api/v1/test_vendor_api_dashboard.py
+"""
+Integration tests for vendor dashboard API endpoints.
+
+Tests cover:
+1. Dashboard stats retrieval
+2. Vendor-specific data isolation
+3. Permission checks
+4. Data accuracy
+"""
+
+import pytest
+
+
+@pytest.mark.integration
+@pytest.mark.api
+@pytest.mark.vendor
+class TestVendorDashboardAPI:
+    """Test vendor dashboard stats endpoint"""
+
+    def test_get_dashboard_stats_structure(
+        self, client, vendor_user_headers, test_vendor_with_vendor_user, db
+    ):
+        """Test dashboard stats returns correct data structure"""
+        response = client.get(
+            "/api/v1/vendor/dashboard/stats",
+            headers=vendor_user_headers
+        )
+
+        assert response.status_code == 200
+        data = response.json()
+
+        # Verify top-level structure
+        assert "vendor" in data
+        assert "products" in data
+        assert "orders" in data
+        assert "customers" in data
+        assert "revenue" in data
+
+        # Verify vendor info
+        assert "id" in data["vendor"]
+        assert "name" in data["vendor"]
+        assert "vendor_code" in data["vendor"]
+        assert data["vendor"]["id"] == test_vendor_with_vendor_user.id
+
+        # Verify products stats
+        assert "total" in data["products"]
+        assert "active" in data["products"]
+        assert isinstance(data["products"]["total"], int)
+        assert isinstance(data["products"]["active"], int)
+
+        # Verify orders stats
+        assert "total" in data["orders"]
+        assert "pending" in data["orders"]
+        assert "completed" in data["orders"]
+
+        # Verify customers stats
+        assert "total" in data["customers"]
+        assert "active" in data["customers"]
+
+        # Verify revenue stats
+        assert "total" in data["revenue"]
+        assert "this_month" in data["revenue"]
+
+    def test_dashboard_stats_vendor_isolation(
+        self, client, db, test_vendor_user, auth_manager
+    ):
+        """Test that dashboard stats only show data for the authenticated vendor"""
+        from models.database.vendor import Vendor, VendorUser
+        from models.database.product import Product
+        from models.database.marketplace_product import MarketplaceProduct
+
+        # Create two separate vendors with different data
+        vendor1 = Vendor(
+            vendor_code="VENDOR1",
+            subdomain="vendor1",
+            name="Vendor One",
+            owner_user_id=test_vendor_user.id,
+            is_active=True,
+            is_verified=True,
+        )
+        db.add(vendor1)
+        db.commit()
+        db.refresh(vendor1)
+
+        # Associate vendor1 with test_vendor_user
+        vendor_user1 = VendorUser(
+            vendor_id=vendor1.id,
+            user_id=test_vendor_user.id,
+            is_owner=True,
+            is_active=True,
+        )
+        db.add(vendor_user1)
+        db.commit()
+
+        # Create marketplace product for vendor1
+        mp1 = MarketplaceProduct(
+            gtin="1234567890123",
+            title="Product for Vendor 1",
+            is_active=True,
+        )
+        db.add(mp1)
+        db.commit()
+
+        # Create products for vendor1
+        for i in range(3):
+            product = Product(
+                vendor_id=vendor1.id,
+                marketplace_product_id=mp1.id,
+                price=10.0 + i,
+                is_active=True,
+            )
+            db.add(product)
+        db.commit()
+
+        # Get token for vendor1 user
+        token_data = auth_manager.create_access_token(test_vendor_user)
+        vendor1_headers = {"Authorization": f"Bearer {token_data['access_token']}"}
+
+        # Get stats for vendor1
+        response = client.get(
+            "/api/v1/vendor/dashboard/stats",
+            headers=vendor1_headers
+        )
+
+        assert response.status_code == 200
+        data = response.json()
+
+        # Should show 3 products for vendor1
+        assert data["vendor"]["id"] == vendor1.id
+        assert data["products"]["total"] == 3
+
+    def test_dashboard_stats_without_vendor_association(
+        self, client, db, auth_manager
+    ):
+        """Test dashboard stats for user not associated with any vendor"""
+        from models.database.user import User
+
+        # Create vendor user without vendor association
+        hashed_password = auth_manager.hash_password("testpass123")
+        orphan_user = User(
+            email="orphan@example.com",
+            username="orphanvendor",
+            hashed_password=hashed_password,
+            role="vendor",
+            is_active=True,
+        )
+        db.add(orphan_user)
+        db.commit()
+        db.refresh(orphan_user)
+
+        # Get token
+        token_data = auth_manager.create_access_token(orphan_user)
+        headers = {"Authorization": f"Bearer {token_data['access_token']}"}
+
+        # Try to get dashboard stats
+        response = client.get("/api/v1/vendor/dashboard/stats", headers=headers)
+
+        # Should fail - user not associated with vendor
+        assert response.status_code == 403
+        data = response.json()
+        assert "not associated with any vendor" in data["message"]
+
+    def test_dashboard_stats_with_inactive_vendor(
+        self, client, db, test_vendor_user, auth_manager
+    ):
+        """Test dashboard stats for inactive vendor"""
+        from models.database.vendor import Vendor, VendorUser
+
+        # Create inactive vendor
+        vendor = Vendor(
+            vendor_code="INACTIVE",
+            subdomain="inactive",
+            name="Inactive Vendor",
+            owner_user_id=test_vendor_user.id,
+            is_active=False,  # Inactive
+            is_verified=True,
+        )
+        db.add(vendor)
+        db.commit()
+
+        # Associate with user
+        vendor_user = VendorUser(
+            vendor_id=vendor.id,
+            user_id=test_vendor_user.id,
+            is_owner=True,
+            is_active=True,
+        )
+        db.add(vendor_user)
+        db.commit()
+
+        # Get token
+        token_data = auth_manager.create_access_token(test_vendor_user)
+        headers = {"Authorization": f"Bearer {token_data['access_token']}"}
+
+        # Try to get dashboard stats
+        response = client.get("/api/v1/vendor/dashboard/stats", headers=headers)
+
+        # Should fail - vendor is inactive
+        assert response.status_code == 404
+        data = response.json()
+        assert "not found or inactive" in data["message"]
+
+    def test_dashboard_stats_empty_vendor(
+        self, client, vendor_user_headers, test_vendor_with_vendor_user
+    ):
+        """Test dashboard stats for vendor with no data"""
+        response = client.get(
+            "/api/v1/vendor/dashboard/stats",
+            headers=vendor_user_headers
+        )
+
+        assert response.status_code == 200
+        data = response.json()
+
+        # Should return zeros for empty vendor
+        assert data["products"]["total"] == 0
+        assert data["products"]["active"] == 0
+        assert data["orders"]["total"] == 0
+        assert data["customers"]["total"] == 0
+        assert data["revenue"]["total"] == 0
+
+    def test_dashboard_stats_with_products(
+        self, client, db, vendor_user_headers, test_vendor_with_vendor_user
+    ):
+        """Test dashboard stats accuracy with actual products"""
+        from models.database.product import Product
+        from models.database.marketplace_product import MarketplaceProduct
+
+        # Create marketplace products
+        mp = MarketplaceProduct(
+            gtin="1234567890124",
+            title="Test Product",
+            is_active=True,
+        )
+        db.add(mp)
+        db.commit()
+
+        # Create products (3 active, 2 inactive)
+        for i in range(5):
+            product = Product(
+                vendor_id=test_vendor_with_vendor_user.id,
+                marketplace_product_id=mp.id,
+                price=10.0 + i,
+                is_active=(i < 3),  # First 3 are active
+            )
+            db.add(product)
+        db.commit()
+
+        # Get stats
+        response = client.get(
+            "/api/v1/vendor/dashboard/stats",
+            headers=vendor_user_headers
+        )
+
+        assert response.status_code == 200
+        data = response.json()
+
+        assert data["products"]["total"] == 5
+        assert data["products"]["active"] == 3
+
+    def test_dashboard_stats_response_time(
+        self, client, vendor_user_headers, test_vendor_with_vendor_user
+    ):
+        """Test that dashboard stats responds quickly"""
+        import time
+
+        start_time = time.time()
+        response = client.get(
+            "/api/v1/vendor/dashboard/stats",
+            headers=vendor_user_headers
+        )
+        end_time = time.time()
+
+        assert response.status_code == 200
+        # Should respond in less than 2 seconds
+        assert (end_time - start_time) < 2.0
+
+    def test_dashboard_stats_caching_behavior(
+        self, client, vendor_user_headers, test_vendor_with_vendor_user
+    ):
+        """Test that dashboard stats can be called multiple times"""
+        # Make multiple requests
+        responses = []
+        for _ in range(3):
+            response = client.get(
+                "/api/v1/vendor/dashboard/stats",
+                headers=vendor_user_headers
+            )
+            responses.append(response)
+
+        # All should succeed
+        for response in responses:
+            assert response.status_code == 200
+
+        # All should return consistent data
+        data_list = [r.json() for r in responses]
+        for data in data_list[1:]:
+            assert data["vendor"]["id"] == data_list[0]["vendor"]["id"]
+            assert data["products"]["total"] == data_list[0]["products"]["total"]