{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/Transaction",
  "title": "Transaction",
  "type": "object",
  "description": "A single financial transaction within a payment (authorization, charge, refund, etc.).",
  "required": [
    "id",
    "type",
    "amount",
    "state"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "System-generated unique identifier for the transaction."
    },
    "timestamp": {
      "type": "string",
      "format": "date-time",
      "description": "When the transaction was processed."
    },
    "type": {
      "type": "string",
      "enum": [
        "Authorization",
        "CancelAuthorization",
        "Charge",
        "Refund",
        "Chargeback"
      ],
      "description": "The type of financial transaction."
    },
    "amount": {
      "$ref": "#/components/schemas/Money"
    },
    "interactionId": {
      "type": "string",
      "description": "PSP-provided identifier for this transaction."
    },
    "state": {
      "type": "string",
      "enum": [
        "Initial",
        "Pending",
        "Success",
        "Failure"
      ],
      "description": "Current processing state of the transaction."
    }
  }
}