This endpoint is used to validate a customer's loyalty program selection against their current order. It provides the channel with final, machine-readable discount details to apply to the basket.

Purpose:

To confirm a customer's selection and receive the final details for a specific program's application. The loyalty provider validates the program against the order using its internal business rules. It's important to note that a single program can result in multiple discounts being applied to the order.

When to Use:

When a customer selects a loyalty program to add to their basket.
Before the customer proceeds to payment, to ensure all discounts are correctly applied.

Internal Logic for Program Application:

Program Availability Verification: The system contacts the loyalty provider to confirm if the selected programs are applicable to the provided basket. The provider is responsible for validating the program's availability and business rules.

Handling Already Applied Programs: If a program has already been applied (and is present in the order's discounts payload), the system will revalidate it without adding any new discounts. This prevents application errors but also confirms the program is still valid for the current order state.

Important Note: The endpoint does not validate the correctness of the discounts that are already present in the order payload.

Endpoint Details

Request Payload: The request includes the list of programIds to be validated and the complete order payload.

This schema defines the complete request body sent to the wallet validation webhook.

Field	Type	Required	Description
`sessionId`	`string`	No	A unique session token linking all related loyalty actions (e.g., retrieve, validate, create order).
`order`	`object`	Yes	See Order schema 🔗
`programIds`	`array of strings`	Yes	A list of program Ids that the customer has selected to apply to their basket.

Example Request:

{
  "sessionId": "TEST1741193909",
  "programIds": [
    "1"
  ],
  "order": {
    "items": [
      {
        "plu": "1324882025",
        "name": "Coke",
        "price": 500,
        "quantity": 2
      }
    ],
    "customer": {
      "email": "john.doe@test.com",
      "phoneNumber": "+32121212121",
      "loyaltyProviderCustomerId": "abc123"
    },
    "decimalDigits": 0,
    "deliveryCost": 0,
    "serviceCharge": 0,
    "orderType": 1,
    "tip": 0
  }
}

Response Schema and Structure

The programs/validate endpoint is transitioning to a new response schema designed for improved flexibility and scalability. This new structure cleanly separates validation results from discount details and standardises how different discount types are represented.

Field Deprecation

We are actively deprecating a number of fields from our previous schema. During a transition period, the API will return a Transitional Response that includes both the deprecated and new fields to ensure backwards compatibility. In a future update, all deprecated fields will be entirely removed.

Response Schema Details

Field	Type	Nullable	Default Value	Deprecated	Description
`programId`	`string`	No	Required	No	The unique identifier of the loyalty program that was validated.
`validationError`	`object`	Yes	`null`	Yes	The legacy object for validation errors. Replaced by the `validationErrors` array.
`validationErrors`	`array of objects`	No	`[]` (empty array)	No	A list of errors. Each object in the array contains a `message` string explaining the failure. This array is empty on successful validation.
`discounts`	`array of objects`	No	`[]` (empty array)	No	A list of validated discount objects to be applied to the order. Empty if validation fails or if the program has already been applied. See Discount Schema page 🔗
`title`	`string`	No	Required	Yes	The display name of the program. This information should be retrieved from the program discovery endpoint (`/programs/retrieve`).
`type`	`string`	No	Required	Yes	The legacy type of the discount. This has been replaced by the `offer` and `scope` fields within the new `discounts` objects.
`applicable`	`boolean`	No	`true`	Yes	Indicates if the customer meets the basic requirements for the program to be applied. The new schema indicates validity by the presence of a response object in the validation endpoint.
`description`	`string`	Yes	`null`	Yes	A description of the program. This information should be retrieved from the program discovery endpoint.
`cost`	`number`	Yes	`null`	Yes	The loyalty cost of the program. This is a program-level detail and is no longer included in the validation response.
`media`	`object`	Yes	`null`	Yes	Display-related media assets. This information should be retrieved from the program discovery endpoint.
`expiresAt`	`string` (ISO 8601)	Yes	`null`	Yes	Program expiration details. This information should be retrieved from the program discovery endpoint.
`discount`	`number`	Yes	`null`	Yes	The specific amount of the discount. This has been replaced by the `value` field within the new `discounts.offer` object.
`itemPLU`	`string`	Yes	`null`	Yes	The PLU of the discounted item. This has been replaced by the `plu` field within the new `discounts.scope` object.
`quantity`	`number`	Yes	`null`	Yes	The quantity of items affected. This is now a field within the new `discounts.offer` or `discounts.scope` objects, depending on the discount type.
`minOrderValue`	`number`	Yes	`null`	Yes	A business rule condition. This is now handled by the loyalty provider's internal logic and will be removed from the validation response.

Discount Type Translation Table (Legacy to New):

Loyalty (Legacy)	Loyalty (New)	Commerce / Order API Types
`discount_amount`	Scope: `order` Offer: `flat_off`	`order_flat_off`
`discount_percentage`	Scope: `order` Offer: `percent_off`	`order_percent_off`
`free_item`	Scope: `product` Offer: `free`	`item_free`
`buy_one_get_one_free`	Scope: `item` Offer: `free`	`item_bogof`
item_discount_amount	Scope: `item` Offer: `flat_off`	`item_flat_off`
item_discount_percentage	Scope: `item` Offer: `percent_off`	`item_percent_off`
`item_fixed_price`	Scope: `item` Offer: `fixed_amount`	N/A

Example Responses

Current Response (Deprecated)

This is the legacy response schema. It is still returned for backwards compatibility but should be considered deprecated.

Example Response:

[
  {
    "programId": "1",
    "title": "$2 OFF",
    "type": "discount_amount",
    "applicable": true,
    "description": "",
    "cost": 10,
    "media": { ... },
    "expiresAt": null,
    "discount": 200,
    "itemPLU": null,
    "quantity": null,
    "minOrderValue": 1000,
    "validationError": {
      "message": "test"
    }
  }
]

Transition Response

This response is provided during the transition period to ensure a seamless migration for clients. It includes both the deprecated fields from the legacy schema and the new, definitive discounts array. This allows clients to update their integrations to the new schema without breaking existing functionality.

Example Response:

[
    {
        "programId": "1",
        "title": "$2 OFF",
        "type": "discount_amount",
        "applicable": true,
        "description": "",
        "cost": 10,
        "media": {},
        "expiresAt": null,
        "discount": 200,
        "itemPLU": null,
        "quantity": null,
        "minOrderValue": 1000,
        "validationErrors": [
            {
                "message": "test"
            }
        ],
        "validationError": {
            "message": "test"
        },
        "discounts": [
            {
                "provider": "loyalty",
                "externalId": "program_123",
                "offer": {
                    "type": "flat_off",
                    "value": 200
                },
                "scope": {
                    "type": "order"
                }
            }
        ]
    }
]

Future Response (New)

This is the new, recommended response schema. It provides a clear and consistent structure for all discount types. It contains only the essential, machine-readable information required to apply a discount to an order.

Example Response:

[
  {
    "programId": "1",
    "validationErrors": [],
    "discounts": [
      {
        "provider": "loyalty",
        "externalId": "program_123",
        "offer": {
          "type": "flat_off",
          "value": 200
        },
        "scope": {
          "type": "order"
        }
      }
    ]
  }
]

Program Revalidation

The validation endpoint supports revalidation, where the initial call will return a new discount, but subsequent calls will not. This is crucial for managing the order lifecycle.

Scenario: A channel first validates two programs (order_flat_off_123 and free_item_123) when the basket is empty.

Request Payload (First Call):

{
  "programIds": [
    "order_flat_off_123",
    "free_item_123"
  ],
  "order": {
    "items": [
      {
        "plu": "P-CO-7TbZ-2",
        "name": "Cola",
        "quantity": 3,
        "price": 500,
        "discountReferenceIds": []
      }
    ],
    "discounts": []
  }
}

API Response:

[
  {
    "programId": "order_discount_123",
    "validationErrors": [],
    "discounts": [
      {
        "provider": "loyalty",
        "externalId": "1",
        "offer": {
          "type": "flat_off",
          "value": 500
        },
        "scope": {
          "type": "order"
        }
      }
    ]
  },
  {
    "programId": "free_item_123",
    "validationErrors": [],
    "discounts": [
      {
        "provider": "loyalty",
        "externalId": "1",
        "offer": {
          "type": "free"
        },
        "scope": {
          "type": "product"
        }
      }
    ]
  }
]

Scenario: The channel applies the first two discounts to the basket and then adds a new program (new_program_item_discount). The new validation request includes all three program IDs.

Request Payload (Revalidation Call):

{
  "programIds": [
    "order_flat_off_123",
    "free_item_123",
    "new_program_item_discount"
  ],
  "order": {
    "items": [
      {
        "plu": "P-CO-7TbZ-2",
        "name": "Cola",
        "quantity": 3,
        "price": 500,
        "discountReferenceIds": [2]
      },
      {
        "plu": "P-CO-7TbZ-2",
        "name": "Cola",
        "quantity": 1,
        "price": 500,
        "discountReferenceIds": [1]
      }
    ],
    "discounts": [
      {
        "type": "item_free",
        "provider": "loyalty",
        "name": "Free",
        "referenceId": 1,
        "value": 500,
        "amount": 500,
        "programId": "free_item_123"
      },
      {
        "type": "order_flat_off",
        "provider": "loyalty",
        "name": "5$ off",
        "referenceId": 2,
        "value": 500,
        "amount": 500,
        "programId": "order_discount_123"
      }
    ]
  }
}

API Response:

[
  {
    "programId": "order_discount_123",
    "validationErrors": [],
    "discounts": []
  },
  {
    "programId": "free_item_123",
    "validationErrors": [],
    "discounts": []
  },
  {
    "programId": "new_program_item_discount",
    "validationErrors": [],
    "discounts": [
      {
        "provider": "loyalty",
        "externalId": "1",
        "offer": {
          "type": "flat_off",
          "value": 500
        },
        "scope": {
          "type": "item",
          "lineIndex": 1
        }
      }
    ]
  }
]

Program Removal

Some loyalty providers may place a temporary lock on a program once it is validated, as a measure for fraud prevention. If a customer selects a program and then decides to remove it from their basket, the channel must call the validation endpoint to signal this removal and release the lock.

To remove a program, the channel should:

Remove the program's ID from the programIds array in the request payload.
Include the program's discount details in the order.discounts payload to explicitly signal its removal from the validation context.

This process informs the loyalty provider that the program is no longer in use, allowing it to be made available to the customer again.

Example: Removing a Program from the Basket

In this example, the customer is removing the program with the ID free_item_123. The order_flat_off_123 program remains selected.

{
  "programIds": [
    "order_flat_off_123",
  ],
  "order": {
    "items": [
      {
        "plu": "P-CO-7TbZ-2",
        "name": "Cola",
        "quantity": 3,
        "price": 500,
        "discountReferenceIds": [2]
      },
      {
        "plu": "P-CO-7TbZ-2",
        "name": "Cola",
        "quantity": 1,
        "price": 500,
        "discountReferenceIds": [1]
      }
    ],
    "discounts": [
      {
        "type": "item_free",
        "provider": "loyalty",
        "name": "Free",
        "referenceId": 1,
        "value": 500,
        "amount": 500,
        "programId": "free_item_123"
      },
      {
        "type": "order_flat_off",
        "provider": "loyalty",
        "name": "5$ off",
        "referenceId": 2,
        "value": 500,
        "amount": 500,
        "programId": "order_discount_123"
      }
    ]
  }
}

Expected Response: The response will only include a validation object for the programs that remain selected (order_flat_off_123). The response for the removed program (free_item_123) will not be returned.

[
  {
    "programId": "order_discount_123",
    "validationErrors": [],
    "discounts": []
  }
]