TRYING TO PAY MY DOCTOR: WHERE'S MY CLIENT ID?

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