Checkout Checkout Request Structure

{
  "$schema": "https://json-structure.org/meta/core/v0/#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/affirm/refs/heads/main/json-structure/checkout-checkout-request-structure.json",
  "name": "CheckoutRequest",
  "description": "Request body for creating or updating an Affirm checkout session, containing all order and customer information required to initiate the Affirm financing flow.",
  "type": "object",
  "properties": {
    "merchant": {
      "$ref": "#/components/schemas/MerchantObject"
    },
    "shipping": {
      "$ref": "#/components/schemas/ContactObject"
    },
    "billing": {
      "$ref": "#/components/schemas/ContactObject"
    },
    "store": {
      "$ref": "#/components/schemas/StoreObject"
    },
    "items": {
      "type": "array",
      "description": "Array of item objects representing the products being purchased in this checkout.",
      "items": {
        "$ref": "#/components/schemas/ItemObject"
      },
      "example": [
        "example_value"
      ]
    },
    "discounts": {
      "type": "object",
      "description": "A map of discount codes to discount objects. Each key is the discount code and each value contains the discount amount and name.",
      "additionalProperties": {
        "$ref": "#/components/schemas/DiscountObject"
      },
      "example": {}
    },
    "metadata": {
      "type": "object",
      "description": "Arbitrary key-value metadata for merchant tracking. Values must be strings.",
      "additionalProperties": {
        "type": "string"
      },
      "example": {}
    },
    "order_id": {
      "type": "string",
      "description": "The merchant's internal order identifier. Stored for future reference and reconciliation.",
      "example": "500123"
    },
    "currency": {
      "type": "string",
      "description": "Three-letter ISO 4217 currency code in uppercase. Supported values are USD, CAD, and GBP.",
      "enum": [
        "USD",
        "CAD",
        "GBP"
      ],
      "example": "USD"
    },
    "financing_program": {
      "type": "string",
      "description": "Financing program code to apply to this checkout, if applicable. Determines the available loan terms presented to the customer.",
      "example": "example_value"
    },
    "shipping_amount": {
      "type": "int32",
      "description": "The total shipping amount in cents.",
      "minimum": 0,
      "example": 1
    },
    "tax_amount": {
      "type": "int32",
      "description": "The total tax amount in cents.",
      "minimum": 0,
      "example": 1
    },
    "total": {
      "type": "int32",
      "description": "The total amount of the checkout in cents (USD, CAD) or pence (GBP).",
      "minimum": 0,
      "example": 1
    },
    "checkout_expiration": {
      "type": "datetime",
      "description": "ISO 8601 timestamp specifying when the checkout session expires.",
      "example": "2025-03-15T14:30:00Z"
    },
    "expiration_time": {
      "type": "datetime",
      "description": "Time-to-live deadline by which the customer must confirm the checkout.",
      "example": "2025-03-15T14:30:00Z"
    }
  },
  "required": [
    "merchant",
    "items",
    "currency",
    "total"
  ]
}