Your transaction may be rejected for any of the following reasons:
Your gift card is already redeemed.
Your gift card is not ‘properly’ activated.
Error messages on the card.
Your gift card is not clear enough.
Your gift card code is wrong.
You submitted an empty trade.
You uploaded the wrong picture
You submitted the wrong trade.
You uploaded an unacceptable receipt (For amazon)
And many more…
Whatever reason it is will be specified along with the rejection.