Integration of Pre-Authorization
Step 1 : Pre-Authorization
The first time must perform web-to-web.Refer to Payment request .
Merchants generate a HTML form that redirects users to Gkash Unified Payment page for the user to ented their credit card details.
Step 2 : Receive response through callbackurl
A server-to-server HTTP payment status notification will respond to the merchant.
Step 3 : Pre-Authorization Complete
This step is to finalized sales amount for pre-authroized transaction.
Merchant need to perform host-to-host(server-to-server) by inserting the previous pre-auth transaction POID as request parameters.Refer to Payment request (Host-to-host)