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

Okay, therefore, I need to cover my doctor's invoice. I logged in the portal and it says I need a client ID. But, I don't have that! What am I supposed to check? Is there a way to access my client ID? Please figure this out. It's really frustrating having to stop payment because of this. Using Veradigm & Pay My Doctor Navigating healthcare expen