I'd like to get someone's opinion with regards to the following:
1. We use authorize.net as the main payment gateway.
2. We need to add a 2nd gateway to handle a payment by "gift card" process. This is really the same as any credit card except we obviously are just going to ask for Name and Card Number.
The gateway code is pretty much written, however it seems the best way to integrate this into the cart is via an add in? What I don't understand is how specifically this addin is called or where? The documentation for add ins is almost non existant and there are no examples or anything with regards to add ins for payment gateways or even their use.
Does anyone have some insight or thoughts on this or should we just not build the add in and add the gateway class directly to the code? Thanks in advance.