MAKING A PAYMENT MY DOCTOR: WHERE'S MY CLIENT ID?

So, I'm going to pay my doctor's fees, and it says I need a client ID. Problem is: I can't find it anywhere! I've looked in the paperwork. Did my doctor's office send it to me? Is there a online system? Any ideas on how to this client ID would be greatly appreciated. Getting into Veradigm Pay My Doctor and Payment Issues Are you running into d