What happens next in this paragraph?

How to get coupons from walmart's savings catcher program via the walmart for iphone app
Enter receipts from store purchases from either walmart's smartphone apps or walmart's online site.
This step is critical. Per policy, you have no more than 7 days to enter the receipt for it to be deemed invalid for use.
Make sure that the receipts don't just have walmart-only items on them. Walmart-only items will only be found at walmart and will never be found at any other store, and thereby will never receive any returned results.