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I use the Shopify Buy Button to sell on external websites, and I am trying to cross sell products and upsell. I want the customer to be able to add on a product in their check-out page. Is this possible?
Have you thought about upsell and cross-sell apps? Our development team has created KAD Upsell & Cross Sell App just to solve such cases as yours.
It will allow you to create numerous special offesr for you cusstomers which will be shown to them on checkout.
Give it a try and let me know if our app could be a useful tool for you.
Here is the link: https://apps.shopify.com/kad-upsell