I am trying to upgrade from MD5 to the new hash method as described here:- https://developer.authorize.net/support/hash_upgrade

We are using SIM still do in addition I read the guide at https://support.authorize.net/s/article/Do-I-need-to-upgrade-my-transaction-fingerprint-from-HMAC-MD....  This second link seems to talk about generating the fingerprint with more values than the first link above does, more similar to how wo do MD5 currently.

I’m having trouble validating matching the value I submit to what is returned in the response.  Note: We need this to work with SIM as we can’t upgrade to the new API currently.

I am creating the hash using the new method and submitting it to the x_fp_hash during the post.  I assume my x_fp_hash is correct because I was previously getting error 99’s which is a fingerprint error, but no longer do.

The response comes back after doing the payment in the x_SHA2_Hash field.  It doesn't compare to x_fp_hash.  So I thought there is more to this.  Looking in the SIM guide, on page 73 at https://www.authorize.net/content/dam/authorize/documents/SIM_guide.pdf it mentions generating a hash from 30 fields.

I've done this and it still doesn't compare to x_SHA2_Hash.  So I assume I am doing something wrong, but not sure.  The documentation doesn't really give any examples of how to do this so I am uncertain what my issue is.