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

So, I'm trying to pay my medical bill, and it says I need a client ID. Here's the catch: I can't find it anywhere! Checked my emails. Did my doctor's office send it to me? Is there a online system? Any suggestions about getting this client ID would be really helpful. Getting into Veradigm Pay My Doctor and Payment Problems Are you facing issue