NEED TO SETTLE MY DOCTOR: WHERE'S MY CLIENT ID?

So, I'm attempting to pay my doctor's fees, and it says I need a client ID. Problem is: I can't find it anywhere! I've looked in everywhere online. Did my doctor's office send it to me? Is there a separate portal? Any ideas on how to this client ID would be greatly appreciated. Getting into Veradigm Pay My Doctor and Payment Issues Are you run