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Use Apple Pay or Android Pay ... you see the charge right on your home screen and view your transactions whenever. The receipt needs and will go the way of the dodo bird, credit card signatures and etc...
Can I submit that with my expense report to get reimbursed for my business expenses?
It's going to take time for payments to all go digital but they will. Whipping out your phone and swiping it and then your done is way quicker and easier then the current payment UX we are doing now.