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

Okay, right, I need to pay my doctor's invoice. I visited the portal and it says I need a client ID. Unfortunately, I don't have that! What am I supposed to do? Is there a way to retrieve my client ID? Can someone figure this out. It's really bothering having to stop payment because of this. Using Veradigm & Pay My Doctor Navigating healthcare e