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I'm trying to run the sample code for Charge A Card from the API Reference but am getting an Uncaught Exception error for JMS\Serializer\Exception\RuntimeException. The long error message ends with "YamlDriver.php on line 38". I've played around with...

I'm just starting to try to integrate the API with my website code in PHP. I've looked at the examples and the API reference for just charging a card. In the response section the example doesn't do anything more than show "Invalid Response" if the "g...