{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://ap2-protocol.org/schemas/open_checkout_mandate",
  "title": "Open Checkout Mandate",
  "description": "Agreement between a user and an agent (or chain of agents) to authorize future checkout actions.",
  "type": "object",
  "required": [
    "vct",
    "constraints",
    "cnf"
  ],
  "properties": {
    "vct": {
      "type": "string",
      "description": "Verifiable Credential Type claim as defined in SD-JWT. MUST be 'mandate.checkout.open'.",
      "const": "mandate.checkout.open.1",
      "default": "mandate.checkout.open.1"
    },
    "constraints": {
      "type": "array",
      "description": "Array of constraints that the future checkout action must abide by.",
      "items": {
        "anyOf": [
          {
            "$ref": "#/$defs/allowed_merchants"
          },
          {
            "$ref": "#/$defs/line_items"
          }
        ]
      },
      "contains": {
        "$ref": "#/$defs/line_items"
      }
    },
    "cnf": {
      "type": "object",
      "description": "Confirmation claim defined in RFC 7800 section 3.1. Used for key binding."
    },
    "iat": {
      "type": "integer",
      "description": "The creation timestamp as a Unix epoch."
    },
    "exp": {
      "type": "integer",
      "description": "The expiration timestamp as a Unix epoch."
    }
  },
  "$defs": {
    "allowed_merchants": {
      "type": "object",
      "description": "Defines the set of possible merchants for this Checkout Mandate.",
      "properties": {
        "type": {
          "type": "string",
          "description": "Constraint type identifier.",
          "const": "checkout.allowed_merchants",
          "default": "checkout.allowed_merchants"
        },
        "allowed": {
          "type": "array",
          "description": "Array of allowed Merchant objects.",
          "items": {
            "$ref": "types/merchant.json"
          },
          "x-selectively-disclosable-array": true
        }
      },
      "required": [
        "type",
        "allowed"
      ]
    },
    "line_items": {
      "type": "object",
      "description": "Defines the sets of line items that are to be present in the Checkout Mandate.",
      "properties": {
        "type": {
          "type": "string",
          "description": "Constraint type identifier.",
          "const": "checkout.line_items",
          "default": "checkout.line_items"
        },
        "items": {
          "type": "array",
          "description": "Array of line item requirements.",
          "items": {
            "$ref": "#/$defs/line_item_requirements"
          },
          "minItems": 1
        }
      },
      "required": [
        "type",
        "items"
      ]
    },
    "line_item_requirements": {
      "type": "object",
      "description": "Defines a line item that must be present in the Checkout Mandate.",
      "properties": {
        "id": {
          "type": "string",
          "description": "Identifier for the line item requirement."
        },
        "acceptable_items": {
          "type": "array",
          "description": "Defines a set of line items that are acceptable for this line item requirement. One and only one must be present in the Checkout Mandate.",
          "items": {
            "$ref": "#/$defs/item"
          },
          "x-selectively-disclosable-array": true
        },
        "quantity": {
          "type": "integer",
          "description": "Required quantity of matching items.",
          "exclusiveMinimum": 0
        }
      },
      "required": [
        "id",
        "acceptable_items",
        "quantity"
      ]
    },
    "item": {
      "type": "object",
      "description": "Defines an item that may be present in the Checkout Mandate.",
      "properties": {
        "id": {
          "type": "string",
          "description": "Unique identifier for the line item. Will often be the SKU."
        },
        "title": {
          "type": "string",
          "description": "Title of the item."
        }
      },
      "required": [
        "id",
        "title"
      ]
    }
  }
}