The 5+ year old version of authorizenet.cfc needed a complete rewrite when CF-2016 was released. The fact that it is now named authorizenet2016.cfc in github.com is kind of a hint as to the complications! I suggest downloading the authorizenet2016.cfc version and see if that helps. Better yet, skip the CFC and just call the well documented authorize.net API directly. Note that Authorize.net is the VISA credit card subsidiary that is their card processing gateway.
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