I’m not sure what others are using for online shopping carts, but I use Thrivecart which gives me that ability to make quick sales funnels with upsells and downsell pages for products and services. They have a few CRM integration but NO SuiteCRM
If you’re looking for a great and easy to use shopping cart I would encourage you to look at this. You can even embed their checkout pages in your own site.
I’m not trying to sell Thrivecart but I’m asking for you help to upvote this integration on their feature request page. Here is the page you can upvote this request.
https://featurerequests.thrivecart.com/home/idea/308/integration-with-mautic-suitecrm
Here is the link to their page if you want to learn more.
Thrivecart.com