We tried Shopify's app, Checkout Blcoks, but that didn't work well for us. The support is really bad. We switched to this one after that: https://apps.shopify.com/upsellpluscheckout; it does the 'people also ordered' option in the checkout. I think y...

Hi @igolabs Nice! It looks like you added this code to a theme file. Which file is this?

Were you able to find a solution to this?

Hi! To avoid friction with customs payment, have you considered setting up shipping from Europe? We've seen that it makes conversion increase by 30-40% when you take that hurdle out. We're based in Belgium and the US! 

Hi! We're trying to figure out if we can show multiple upsell/downsell offers on the post-purchase page. This would mean that a customer sees the primary offer first and then sees a specific offer based on whether they accept or reject the first one....

If you want to add that to the checkout, you're correct, you'll need an app that will modify the checkout.liquid file.This might be able to do what you're looking for (mostly the app): https://www.upsellplus.com/Good luck!