how do i know for sure that this app does not contain a virus?
Personal information about our users is used by each such service to process payment transactions and for no other purpose, and this information is subject to  Stripes privacy policy and terms of use found at https://stripe.com/us/terms; Apples iTunes privacy policy and terms of use found at http://www.apple.com/legal/privacy/ and http://www.apple.com/legal/internet-services/itunes/us/terms.html; Google Plays privacy policy and terms of use found at https://www.google.com/intl/en/policies/privacy/ and https://play.google.com/about/play-terms.html; and Shopifys privacy policy and terms of service found at https://www.shopify.com/legal/privacy and https://www.shopify.com/legal/terms.