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

Okay, right, I need to settle my doctor's invoice. I went the portal and it says I need a patient code. However, I am missing that! What am I supposed to check? Is there a way to find my client ID? Help me figure this out. It's really annoying having to halt payment because of this. Veradigm and Pay My Doctor: How to Use It Navigating healthcare