where write 4-character code

i am gameflip seller. my customer can’t find where to write this 4 digit code.pls help me

Hello,

Your question is not clear. Which 4 character code are you talking about? Since your a seller, I assume you meant the Payment Verification code that your buyer needs? Buyer needs to confirm the code. Gameflip will ask for the code.

Regards,
Sparkling.