MD5 only in webhook "md5" field

[9mm]

Issue Brief

As of today, webhook is sending sha256/other hash types in the "md5" field of the webhook. It appears this comes from the userid field.

Expected result

I would expect "md5" is always and md5 hash of the email, lowercase, stripped of leading/trailing whitespace.

If MD5 isn't available then it should just return "" blank