I tested the patch along with the patch as in #2813401-33: Use Accept.js to ease PCI requirements.. It is not working. I see erroros.
Warning: SimpleXMLElement::addChild(): unterminated entity reference SOMETHING in CommerceGuys\AuthNet\Request\XmlRequest->arrayToXml() (line 38 of /home/myproj/www/myproj/docroot/vendor/commerceguys/authnet/src/Request/XmlRequest.php)
The 'AnetApi/xml/v1/schema/AnetApiSchema.xsd:name' element is invalid - The value '' is invalid according to its datatype 'String' - The actual length is less than the MinLength value.
Received response with code Error from Authorize.net: E00003: The 'AnetApi/xml/v1/schema/AnetApiSchema.xsd:name' element is invalid - The value '' is invalid according to its datatype 'String' - The actual length is less than the MinLength value.