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We have been experiencing an intermitten issue when using Oauth for the Authorize.net API over several months. We have many customers using different merchant accounts that we handle API request on behalf of. It appears that every now and then, one o...

With the recent changes to the MD5 Hash, I was testing in the Sandbox where the MD5 Hash parameter is supposed to be disabled. In testing I found that if we did ot supply either the "x_fp_hash" nor the "x_SHA2_Hash" parameters we were met with an err...

I am working on adding Oauth support to my Authorize.net API integration. My existing system has logic in place to use the "state" parameter both to validate and redirect users to the necessary page after requesting the initial token. I am looking to...