https://community.developer.cybersource.com/t5/Integration-and-Testing/Relay-Response-SIM-processing-based-on-POST/m-p/54281#M29287 <P>My transactions are posting to my designated URL and I can access the Request.Form values. My question is how do I know this really came from AuthorizeNet? I want to do some processing based on a successful Payment Form transaction. Thanks</P> Fri, 08 Apr 2016 20:41:37 GMT Scott5859 2016-04-08T20:41:37Z https://community.developer.cybersource.com/t5/Integration-and-Testing/Relay-Response-SIM-processing-based-on-POST/m-p/54281#M29287 <P>My transactions are posting to my designated URL and I can access the Request.Form values. My question is how do I know this really came from AuthorizeNet? I want to do some processing based on a successful Payment Form transaction. Thanks</P> Fri, 08 Apr 2016 20:41:37 GMT https://community.developer.cybersource.com/t5/Integration-and-Testing/Relay-Response-SIM-processing-based-on-POST/m-p/54281#M29287 Scott5859 2016-04-08T20:41:37Z https://community.developer.cybersource.com/t5/Integration-and-Testing/Relay-Response-SIM-processing-based-on-POST/m-p/54282#M29288 <P><A href="http://developer.authorize.net/api/upgrade_guide/" target="_blank">http://developer.authorize.net/api/upgrade_guide/</A></P><P><A href="http://www.authorize.net/content/dam/authorize/documents/SIM_guide.pdf" target="_blank">http://www.authorize.net/content/dam/authorize/documents/SIM_guide.pdf</A></P><P>Read the "Using the MD5 Hash Feature"</P> Fri, 08 Apr 2016 20:56:17 GMT https://community.developer.cybersource.com/t5/Integration-and-Testing/Relay-Response-SIM-processing-based-on-POST/m-p/54282#M29288 RaynorC1emen7 2016-04-08T20:56:17Z