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What is the MD5 Hash security feature and how am I supposed to use it?

April 26, 2017feature hash MD5 security

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What is the MD5 Hash security feature and how am I supposed to use it?

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The MD5 Hash is an optional security feature and can be used on the merchant side to verify that a transaction response was actually sent by Authorize.Net. This feature is intended to be used when a relay response is configured for SIM, and is not necessary for use with AIM. To effectively use this feature, you will need to provide a MD5 input value in the Merchant Interface, develop a process to generate your own hash, and determine if that value matches the hash provided in the transaction response. For more information about the MD5 hash security feature, see our Implementation Guides.