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New MD5 Hash Changes

I really need some help here with this. I would first like to know how come the first I am hearing of this is from my clinets who received the email only 2 weeks before  we have to fix things....How are we suppossed to properly fix and text in that short period of time.


Second, I cannot find any concrete information about what is actually changing at the end of the month and my attempt to reach out directly to Authorize.NET has not been answered....According to the link the only current change is that Authorize.NET is removing the ability for clients to enter the MD5 hash on their side and other changes will come at a later date. Is this correct?


Do we need to make any changes to our code directly as of January 31st?


Also is the Sandbox/testing environment already updated? So if that is working properly now are we good to go come end of Janurary?


Thank you!

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