8.15. How do I setup a new real time payment processor that isn't yet supported by Interchange?
If the payment processor that you would like to use isn't supported by Interchange out of the box, then a new payment module would need to be developed for that processor before you could use them.
If you are up to the task of programming a new payment processor module yourself, the ICDEVGROUP would be happy to add your contribution to the growing list of Interchange-supported payment processors. Feel free to take a look at the lib/Vend/Payment directory to see examples of current payment modules.
If developing the module on your own isn't an option, you may engage a competent Interchange developer to do it for you or use one of the already-supported payment modules.