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

Okay, so, I need to pay my doctor's invoice. I went the system and it says I need a patient code. However, I can't that! What am pay my doctor client id number I supposed to check? Is there a way to find my client ID? Can someone figure this out. It's really annoying having to halt payment because of this. Veradigm and Pay My Doctor: How to Use I