I'm a student and intern for a payment processing company (think PayPal-esque) preparing for launch. We have already built integration with Shopify, and I'm researching and preparing a report to recommend which channel(s) we should build integration with next. Initial frontrunners are WooCommerce and Magento (most of my research has been looking at Builtwith and reading other online sources). I'm interested in any advice / knowledge / recommendations that anyone (especially ecommerce pros) has to share before our devteam begins coding for integration. Thanks!