8. Transaction Call Back Request

The transaction status along with additional transaction information is posted to the callback URL configured for a merchant. There are two callback requests posted to the URL where the status codes indicate the following:

Code	Description
Invalid amount	For example, 0.01.
Missing mandatory request field	For example, element 'card': The attribute 'type-id' is required but missing.

The following parameters are sent in the callback:

Field	Mandatory	Description
mpoint-id	Yes	This is the transaction/@id generated during initialize step.
session-id	Yes	Internal session ID.
orderid	Yes	This is the transaction/@order-no in the initialize request, like PNR.
status	Yes	Transaction status code indicates successful or failure.
mobile	Yes	If present in the transaction requests, same will be returned.
amount	Yes	Transaction amount.
Fee	Yes	Default is 0.
currency	Yes	Transaction code.
language	Yes	If present in the transaction requests, same will be returned.
operator	Yes	If present in the transaction requests, same will be returned.

Note: For details about transaction call back, refer to the Callback Request to Merchant from Velocity Integration Guide.