We already make use of the Open Payment Gateway Core to process credit card deposits on our bookstore. However, the Open Payment Gateway Core only implements the "CopyAndPay" API as per below.
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We would like to implement the "server to server" API, whereby we capture the credit card details and forward them on to the gateway rather than the gateway asking the user for credit card info.
We unfortunately need to use OpenCart 22.214.171.124 for various reasons, so the payment module will need to be compatible.
We have an example of the server2server API in Java that can be used to mimic the php concept.