Seriously Lost...

[FGatlin]

I have to move a company away from PayPal, and into Authorize.Net. However, I am absolutely lost. I am a recent graduate of IT, and a beginner Developer, but I did not write this code, and it is confusing me.

I am including a zip file with the PHP code we currently use...

http://gomelco.com/checkout.zip

ANY help at all is greatly appreciated!

[RaynorC1emen7]

There are sample code

But you need to know which API to use first. https://developer.authorize.net/api/compare/