where in the codification do I look for this

Runway Discount (\"Runway\" or the \"Company\") is a privately held online retailer that sells discounted high-end fashion. It competes with three other online retailers and many traditional retailers. In an effort to increase its sales and customer base, Runway implemented a customer referral marketing campaign (the \"Refer-a-Friend Program\") whereby existing customers can refer friends to Runway and receive a $25 credit towards the purchase of future merchandise. The terms of the program are as follows: Runway offers existing customers (the \"Existing Customer') a $25 credit (the \"$25 Referral Credit\") if the Existing Customer refers a friend (the \"New Customer\") to Runway's Web site and the New Customer purchases merchandise from Runway. After a purchase is made by the New Customer, the Existing Customer receives a $25 credit to be applied to a future purchase from Runway. Management anticipates the program will increase current revenue by 15%. Runway is not aware of any other competitor having such a program. It is anticipated that the program will be in place for five years or until sales increase by 50%. The $25 Referral Credit represents the fair value of the cost Runway would pay to acquire a new customer from an unrelated third party or marketing firm who is not a purchaser of its products. The program is open to all of Runway's customers and does not need to be combined with any initial or existing purchases. Runway is planning to adopt IFRSs in the near future. Required: Research US and international accounting standards to determine how to account for the Referral Credit under both GAAP and IFRS. Write a letter to Runway's President summarizing your findings and indicating what authority supports your conclusions. This is a paired case assignment