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. Here's the catch: I can't find it anywhere! Searched my emails. Did my doctor's office send it to me? Do they have a separate portal? Any suggestions about getting this client ID would be really helpful. Getting into Veradigm Pay My Doctor for Payment Problems Are you experie