There are a few reasons your promo code may not be working:
- You have already entered another promo code, referral code, or groupon code. Most codes cannot be doubled up. If you have already used another promo code, it's likely that the one you are trying to use cannot be applied in conjunction with the first one you entered.
- You have already earned money using the app. Promo codes are designed to encourage first time use. If you have already earned money, the code may not work. You can continue earning money at tens of thousands of merchants or by referring people.
- The promo code is no longer live or is slightly off. In this case, try variants on the code you heard. If that doesn't work, you can use the promo code welcome05 for a 5¢/gal bonus on your first purchase.