Not sure about the G639 requester and consenter question. Kelly (Cbrosa7) will know.
The A# they want is the INS registration number on the COC or on your child's visa in their Guat passport. This is your child's assigned number that their file is tracked by. The other number at the top of the COC is the certificate number. Now why they both have to start with an 'A' I have no idea! One of the many mysteries of USCIS!
