A "Trade" allows two Indiegala users to exchange a serial key of a game with one another.
It's possible to carry out a "Trade" on Indiegala with both keys that have been redeemed or not, In the case that the serial key has NOT been redeemed, the "Trade" is 100% guaranteed. Therefore, if the serial key should not work, Indiegala commits to provide a valid key.
In the case that the serial key has already been redeemed, or has not been bought on Indiegala, the "Trade" involved is NOT guaranteed. Therefore, Indiegala is not liable for providing a valid key.