Promotions Entity

{
  "isApplied": true,
  "couponName": "Summer Sale - 20% Off",
  "discountType": "percentage",
  "discountAmount": 24.00,
  "discountedItems": [
    {
      "productId": "PROD_123",
      "quantity": 1,
      "price": 120.00,
      "discount": 24.00
    }
  ]
}

POST /api/v4.0/integrations/coupons/automatic
{
  "customerId": "customer_123",
  "cartId": "cart_456",
  "totalPrice": 150.00,
  "totalShipping": 10.00,
  "lineItems": [
    {
      "productId": "PROD_789",
      "title": "Summer Dress",
      "price": 50.00,
      "quantity": 3,
      "collection": ["summer_2024"]
    }
  ]
}