Completes a session by posting the following request to the callback URL. This step is optional and only applies to non-hosted sessions:

{
   "session_id": "sid_llraltf4jlwu5dxdtprcv7ba5i",
   "amount" : 6540,
   "currency": "USD",
   "status": "approved",
   "authentication_type": "regular",
   "authentication_category": "payment",
   "reference": "ORD-5023-4E89",
   "approved": true,
   "protocol_version": "2.2.0",
   "response_code": "Y",
   "response_status_reason": "01",
   "cryptogram": "MTIzNDU2Nzg5MDA5ODc2NTQzMjE=",
   "eci": "05",
   "xid": "XSUErNftqkiTdlkpSk8p32GWOFA",
   "cardholder_info": "Card declined. Please contact your issuing bank.",
   "challenged": true
}

<br/> The fields of the above are the same as they would be in a GET session response. If the callback URL fails, we recommend that you use a GET call as a fallback.