If you do, you should make sure you understand the privacy and personal information implications. CTV reports that some Canadian retailers are now offering their customers an "e-receipt", which they can receive by email or access at dedicated websites. Sure, it's a "green" option, and maybe more convenient for customers who want to track their purchases, but it requires the customer to provide an email address, which might allow retailers to "learn a lot about a customer's preferences and buying habits".