You can keep track of your spending history by tapping on "My Activity" icon on the header bar of your home screen (top left for iOS and top right for Android).
You can also see a breakdown of your spending history per retailer by scrolling to the bottom of a retailer's store.
Good news - you can now export your receipts individually. Select the relevant receipt and click on the Download button next to the price of your purchase to export the receipt either in PDF or CSV format.
Afterwards you will be able to send the receipt by email, text, or even print it.