Abstract: A software development kit (SDK) allow a user to be able purchase a gift card through an offer wall and, in return, the user can receive a reward in game currency, such as coins, diamonds, tokens or the like. Most mobile apps offer their users a way to purchase coins, diamonds, tokens, or the like, which is also known as an in-app purchase. The gift card offer wall can allow the game player to purchase a gift card from a choice of vendors, and, in return, obtain the desired game currency as a bonus. The system can include three elements—the SDK for various platforms, an electronic wallet application and servers that communicate with both the SDK and the wallet application. The SDK is something that the app publisher can add to their own mobile application that will launch the gift card offer wall for the user.