FRUSTRATED PAY MY DOCTOR: WHERE'S MY CLIENT ID?

Okay, right, I need to settle my doctor's bill. I logged in the portal and it says I need a client ID. However, I don't have that! What am I supposed to check? Is there personapay pay my doctor login a way to retrieve my client ID? Help me figure this out. It's really bothering having to pause payment because of this. Veradigm and Pay My Doctor: