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

So, I'm going to pay my statement, and it says I need a client ID. Problem is: I can't find it anywhere! Checked the paperwork. Did my doctor's office send it to me? Is there a online system? Any tips for finding this client ID would be greatly appreciated. Getting into Veradigm Pay My Doctor and Payment Complications Are you facing problems a