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In my code I have defined a custom field: $transaction->setCustomFields('cart_id', '1'); $response = $transaction->authorizeAndCapture(); if ($response->approved) { $cart_id = $response->cart_id; //...do stuff with $cart_id } However, I get this erro...

I'm using the sample PHP code for ANet in which the form submits directly to: https://test.authorize.net/gateway/transact.dll Everything works fine, but I want to perform validation on the form fields before submitting them to ANet. This is important...

I have a custom merchant defined field called "sub_type" that is submitted along with the customer's credit card information. In the Merchant Email Receipt, "sub_type" is included under "MERCHANT DEFINED" with the correct value, so I am submitting th...

I've just started using Authorize.net for the first time, so I downloaded the PHP sample code and hosted it on a local server (WAMP). I added my API Login and Transaction Key to config.php (I'm positive they're correct). However, when I click "Buy" o...