I worked with OpenCart about 2 years ago, so my memory is fuzzy but I believe it hooked into paypal either out of the box, or it had an official plugin for that

I worked with OpenCart about 2 years ago, so my memory is fuzzy but I believe it hooked into paypal either out of the box, or it had an official plugin for that. What I liked about OpenCart plugins is that the paid ones were a one time fee, instead of subscription basis bullshit that solutions such as Shopify offer. And of course you could always just hack into the code yourself to customize it. They had simple analytics for shoppers and their flow built in I believe, don't recall if there was anything for marketing.