An optional outlet ID for clients that support multiple stores in the same developer app.

Gateway transaction identifier as returned in the parameter ipgTransactionId or merchantTransactionId. In case you want to use the merchantTransactionId to query the transaction status use this format: .../payments/merchantTransactionId= This is applicable for other scenarios as well, such as void, refund or other secondary transactions.

Gateway order identifier as returned in the parameter orderId.

The ID code from the payment URL.

The transaction time in seconds since epoch.

Content type.

A client-generated ID for request tracking and signature creation, unique per request. This is also used for idempotency control. We recommend 128-bit UUID format.

Key given to merchant after boarding associating their requests with the appropriate app in Apigee.

Used to ensure the request has not been tampered with during transmission. The Message-Signature is the Base64 encoded HMAC hash (SHA256 algorithm with the API Secret as the key.) For more information, refer to the supporting documentation on the Developer Portal.