Receipts must be uploaded within 14 days of the transaction date on the receipt to qualify for rewards.
This 14 day window is calculated from the exact time of the transaction to the exact time of upload to the app, regardless of time spent processing. Why risk missing out on rewards? Upload your receipts as you receive them! :)
Age is no object! How many can I upload?
Now that you've got that down, learn what kinds of receipts qualify!