I have a client that is using a third party credit card processing company and we are using an Authorize.net emulator all of the info is goin though how ever I need to add a zip code field to be sent to authorize.net to approve payment. Where or how do I do this?
I don't know how to answer this question because I don't know how the emulator works. I think you will have to look at the file components/com_eventbooking/payments/os_authnet.php, then modify the code of that payment plugin to pass necessary data required by the emulator.
Could you please try that and let us know the result ?