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

Okay, right, I need to settle my doctor's invoice. I went the website and it says I need a patient code. However, I don't have that! What am I supposed to check? Is there a way to access my client ID? Can someone figure this out. It's really frustrating having to stop payment because of this. Veradigm and Pay My Doctor: How to Use It Navigating