Reference : API Extensions

API responses may contain an "extensions" field in addition to the standard "data" field if certain request headers are specified.

API Usage & Billing

Billing stats about the current request may be returned within the "extensions" subdocument by including a x-twisp-include-billing: true header in the request.

For example, here's is a response from invoking a bank transfer tran code with postTransaction and the x-twisp-include-billing HTTP header set to true:

{
  "data": {
    "postTransaction": {
      "transactionId": "5c328550-bba3-423b-a58a-b3f9786a80ad"
    },
  },
  "extensions": {
    "billing": {
      "duration": 229272730,
      "read": {
        "bytes": 5604,
        "count": 10,
        "units": 10
      },
      "write": {
        "bytes": 4850,
        "count": 16,
        "units": 16
      }
    }
  }
}