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Hi! I'd like to give our donors the option to pay in installments (such as to pay a certain amount billed automatically each month). I think somewhere in my research of setting up my SIM, I've encountered some string of code or URL I needed to do thi...

Hi! I'm having trouble doing the redirect after a SIM checkout. I'm adding the URL in name='x_relay_url', but apparently it works with some URLs and not others, and I can't see the pattern. I'm using both a test sandbox account and a live account to ...

I've managed to build a form which takes payment and processes it using SIM. It's loosely based on this: https://community.developer.authorize.net/t5/Integration-and-Testing/SIM-Sample-Code/m-p/55258/highlight/false#M30174 My challenge now is that I ...

Hi! I'm new to this, but I'm trying to build a form in PHP which can perform simple checkouts. I need to provide custom fields and a custom cost. I'm trying to get started, but I'm having some trouble. It seems all the sample code I find is incomplet...

Hi! I'm trying to create a checkout script in HTML and PHP which can easily allow custom fields and make simgle purchase payments. This is proving to be quite the challenge, and I'd like to ask your advice as to how to approach this. I've created a f...