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

So, I'm attempting to pay my statement, and it says I need a client ID. The thing is: I can't find it anywhere! Searched the paperwork. Did my doctor's office send it to me? Do they have a different website? Any tips for finding this client ID would be really helpful. Logging in to Veradigm Pay My Doctor and Payment Problems Are you running in