Update mandate request

{
  "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "currency": "AUD",
  "system": "PAY_TO",
  "mode": "RECURRING",
  "purpose": "OTHER",
  "internalReference": "H35X48Y4FWOD6G3S",
  "payer": {
    "reference": "JDOE-101",
    "firstName": null,
    "lastName": null,
    "email": null,
    "accountIdentifiers": {
      "accountName": "John Doe",
      "payId": "john@doe.com",
      "payIdType": "EMAIL"
    }
  },
  "beneficiary": {
    "name": "Jane Doe"
  },
  "validity": {
    "from": "2026-03-01 00:00:00",
    "to": null
  },
  "payTo": {
    "accountIdentifiers": {
      "accountName": "John Doe",
      "payId": "john@doe.com",
      "payIdType": "EMAIL"
    },
    "limits": {
      "periodic": {
        "period": "MONTH",
        "maxPaymentsCount": 3
      },
      "payment": {
        "maxAmount": 70000
      }
    },
    "description": "Coffee subscription #123123"
  },
  "device": {
    "ip": "192.168.0.1",
    "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X x.y; rv:42.0) Gecko/20100101 Firefox/42.0",
    "fingerprint": "2aae6c35c94fcfb415dbe95f408b9ce91ee846ed"
  },
  "status": {
    "status": "AWAITING_AUTHORISATION",
    "details": null
  },
  "mandateSetupFlow": {
    "status": "PROCESSING"
  }
}

{
  "code": "MISSING_HTTP_HEADER",
  "message": "Missing \"X-Volt-Initiation-Channel\" HTTP header."
}

{
  "code": "UNAUTHORISED",
  "message": "Unauthorised."
}

{
  "code": "ACCESS_DENIED",
  "message": "Access denied."
}

{
  "code": "IDEMPOTENCY_CONFLICT",
  "message": "Idempontency key already used."
}

{
  "code": "VALIDATION_FAILURE",
  "message": "Validation failed.",
  "errors": [
    {
      "type": "TOO_LONG",
      "propertyPath": "payTo.accountIdentifiers.bsb",
      "message": "BSB must have a maximum of 6 characters"
    }
  ]
}

{
  "code": "UNAUTHORISED",
  "message": "Provided credentials are invalid."
}

{
  "code": "INTERNAL_SERVER_ERROR",
  "message": "Something went wrong. Please, contact support. TraceId: b8cfd344-093c-4b8c-8fd4-f0e406060c3c. Timestamp: 1723193467."
}