It was confusing... Lesssee....
It was this: USCG Merchant Mariner User Fee Payment
Here is the link:
You will get an automated email message that begins thus:
Your payment has been submitted to Pay.gov and the details are below. If you have any questions regarding this payment, please contact National Maritime Center firstname.lastname@example.org
at (888) 427-5662.
Application Name: Merchant Mariner User Fees
Pay.gov Tracking ID: REDACTED
Agency Tracking ID: REDACTED
Transaction Type: Sale