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? Do they have a online system? Any tips for finding this client ID would be really helpful. Logging in to Veradigm Pay My Doctor with Payment Issues Are you experiencing