ARB silent posts not validating

[mkleyzit84]

Hi,

I am having issues validating Silent Post requests for ARB.  More specifically, AuthorizeNet.SIMResponse.Validate() returns false on ARB silent posts. If I do a one-time purchase then Validate() returns true and everything works fine.

I looked closer at the Silent Post request parameters and discovered that the x_MD5_Hash value is different for every ARB request.

I did some experimentation with one-time and ARB purchases. I placed 3 one-time purchases of 100.00 and 3 ARB of 100.00. Here are my sandbox credentials:

API Login: 34dH2y7U5Js7

Transaction Key: 9Ue5tb5x5Z8X92cG

MD5 Hash: 12345

When I receive the one-time purchase silent posts, all 3 had x_MD5_Hash value 9E2D473765921FEE2E03B983F338E277, which validated correctly. However, when I receive silent posts for ARB, the x_MD5_Hash values were all different: 7C498583D0E6B05E36742B0CB90D1A27, FCACD569BA57835ADBE191FB309F029A, 4891A406F90B98C837AF795D85D588E5, and none of them validated.

I was under the impression that x_MD5_Hash value depends only on API Login, Transaction Key, MD5 Hash, and purchase amount. Since they are all the same then why are ARB x_MD5_Hash values all different?

Also, can I use the AuthorizeNet.SIMResponse.Validate() API on ARB calls? If not, what is the alternative?

Thanks for your help

[RaynorC1emen7 · Accepted solution]

Answer:

http://community.developer.authorize.net/t5/Integration-and-Testing/Incorrect-MD5-hash-information-i...

So you probably need to change the Validate() routine or use a blank loginID for ARB silent post.

[mkleyzit84]

Thanks worked like a charm. I called SIMResponse.Validate([MD5 Hash], "")