Adding custom payment gateway
You can specify the external payment system page of your choice. To do this, you need to specify the URL of the payment system. Go to Service preferences and specify the URL in the "Payment system URL" field.
After that, users can use the specified payment system by clicking "Add money" link in the "Account" section.
Passing user ID
If you need to pass the user ID to your payment system, you need to add /?id={id} after payment system URL.
So the link should look like this:
http://test.pay.test/?id={id}
When your users log into their account, {id} variable will be replaced with their user ID and the "Add money" link will look like this: http://test.pay.test/?id=12345
Auto filling
If you need your payment system page to be auto refilled with some user data, you can make it by some custom application that uses our API.