Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.

Shopify Upsell Bundles App - Shopify app to Create Bundles, Packages and Sets with discounts by the most simple and efficient...

Shopify Pay - Give shoppers a fast, secure way to pay

ReConvert - Page builder to design thank you page that cross sell & upsell

Stripe iOS SDK - Accept both Apple Pay and credit card payments easily on iOS

Shop'fy Stash - Curated list of tools to help build your Shopify Business