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! Searched everywhere online. Did my doctor's office send it to me? Do they have a different website? Any ideas on how to this client ID would be greatly appreciated. Accessing Veradigm Pay My Doctor with Payment Problems Are you fac