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

So, I'm going to pay my medical bill, and it says I need a client ID. The thing is: I can't find it anywhere! Checked the paperwork. Did my doctor's office send it to me? Is there a different website? Any ideas on how to this client ID would be greatly appreciated. Accessing Veradigm Pay My Doctor and Payment Problems Are you running into issu