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I have integrated Authorize.net into my website with code. I have been using the sandbox and have just switched to my actual gateway. Now all transaction responses are null, whether its in live mode or test mode. I used var_dump on my Transaction Res...

I have copied and pasted the sample code provided on this site, and it was working. I just went back to test it again today, but now it throws these errors: Warning: include(C:\xampp\htdocs\phplod\bids\sdk-php-master/vendor/jms/serializer/src/JMS/Ser...