Associating remote auth users with zoho support contacts. without inviting

Associating remote auth users with zoho support contacts. without inviting

I have the remote authentication working!

From what I can see there is only one way to make a contact a support user that can login. "Invite the contact" which expires. 

Is there a way to bypass this signup process. Since we are using a different credentialing system, they have accounts but not tied to the zoho support system contacts.

How do we manage this for existing customers? 
How do we manage this for new customers which we assign a system id and password? 

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