To get the best results, it makes sense to upload the receipt to Bonsy right after you receive it at the checkout. Since the receipt is probably the least wrinkled at that time, you will most likely get the best results. Make sure the lighting is correct and use the flash if necessary.
Even though the result is usually visible in the app after a few seconds, you don't necessarily have to wait for it. You can also simply upload the photo to Bonsy and Bonsy will notify you as soon as the categorization of the receipt is finished. To do this, please enable push notifications.