Uptill now, Magento used the MD5 based hash to implement the Authorize.Net Direct Post payment method. But not anymore after Authorize.net announced MD5 Hash End of Life & Signature Key Replacement!
Hence, it is required to update Authorize.Net Direct Post from MD5 to SHA – 512 in Magento for capturing secure payments.
Steps to Update Authorize.Net Direct Post from MD5 to SHA – 512 in Magento:-
Apply the patch
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Get a New Signature Key
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Update the Magento Admin Configuration
Check the detailed implementation of the above steps at https://meetanshi.com/blog/update-authorize-net-direct-post-from-md5-to-sha-512-in-magento/