For anyone that can't read embeds:
Gamestop is doing a "Garanteed to love it" program, starting with Days Gone. When you buy Days Gone at Gamestop, you will get a code printed on your recipet that notes the date of purchase. You can take the opened copy of Days Gone back to Gamestop and trade it in within 48 hours of purchase, and you will receive a trade-in credit of 59.99. This promotion will only be available on the standard edition of the game, and you must purchase the game within 48 hours of the launch date of the game. The credit is exempt from any promotions (such as Pro Membership or any other promotions), does not include any sales tax that you pay (though in many states, items bought with trade credit are exempt from sales tax), and employees are not eligible. And while it isn't listed on the sheet, you aren't going to get cash back
This very much looks like a test for something they may try full-scale down the line if it works out for them, or it might be a one-and-done like the rental program they tried a few summers ago. Regardless, this is basically a Steam-like refund for a physical game- buy it, open it and play it, and if you don't like it, you can get your full value back and purchase a different game