Yesterday transactions started failing while using authorize.net php API. But after looking at the logs, the transactions weren't failing at all. In fact, I get response code 1: {"code":"1","description":"This transaction has been approved."}. However, I also get: {"code":"E00013","text":"The field is invalid."} at the same time, which was triggering my fail logic. I changed my fail logic so the transaction goes through on my site but would like to know what is causing the error E00013. It gives no reference. I did a basic test that uses only a card and amount, and the error still comes through in the response. I literally checked each field and then did nothing but test card data and amount. I have no idea what to do now?? Any help would be appreciated.
