NEED MY DOCTOR - WHERE'S MY CLIENT ID?

I recently got a bill from my doctor and it clearly states that I need a client ID to complete the payment. However, I can't seem to find this ID anywhere. I've looked my files thoroughly but it's just not there. Could anyone help me on how to obtain this client ID so I can settle my bill? Pay for Your Doctor with Veradigm Veradigm Pay My Docto