Game Initiated Payment API
Game Initiated Payment API is designed to write off payments automatically from users' accounts. The write-off option is available, if a user is subscribed to some of the payment systems.
Subscription process goes in Game Initiated Payment Plug-in. The Plug-in Installation Guide is here.
For initiating a payment it's enough to invoke this gateway with denoted parameters. The denoted parameters work for searching a subscriber, the subscription details, the payment option and for payment processing.
API is located at:
https://secure.xsolla.com/repayment/purchase/
