API Playground

POST /v1/authorize-order-change. Every request requires a unique request_id and nonce. Decisions are deterministic; an LLM is never used for authorization.

{
  "request_id": "req_demo_001",
  "nonce": "nonce_demo_001",
  "operation": {
    "type": "exchange"
  },
  "original": {
    "order_id": "order_1001",
    "checkout_hash": "sha256:original-checkout",
    "merchant_id": "merchant_store",
    "currency": "USD",
    "one_time_total_minor": 10000,
    "recurring": [],
    "line_items": [
      {
        "id": "shoe-42",
        "quantity": 1,
        "unit_price_minor": 10000
      }
    ],
    "authorization": {
      "max_additional_one_time_minor": 2500,
      "allow_recurring": false,
      "max_recurring_delta_minor": 0,
      "allowed_merchants": [
        "merchant_store"
      ],
      "allow_currency_change": false,
      "allow_multi_merchant": false,
      "allow_quantity_increase": false
    }
  },
  "proposed": {
    "merchant_id": "merchant_store",
    "currency": "USD",
    "one_time_total_minor": 11700,
    "recurring": [],
    "line_items": [
      {
        "id": "shoe-43",
        "quantity": 1,
        "unit_price_minor": 11700
      }
    ]
  }
}

Ready.

MCP

Connect to https://changemandate.xguardgate.com/mcp and call authorize_order_change.

Machine discovery

/.well-known/changemandate · /.well-known/x402 · /openapi.json