Other suggestions:

* PayPal Express: pass logo image for setup request [dimko] https://github.com/Shopify/active_merchant/commit/9896bd7b64b4eb3496051aa385deae02a9619e94
* Improve credit card validation [duff] https://github.com/Shopify/active_merchant/commit/821f14dcf8132bbec55324874d7009766655789b