I'd like to encourage more people to make a second purchase by adding a "buy another" button at the bottom of our cart.
The button would appear when the user has one item from a specific collection in their cart.
If they had two products, or no products from that collection, then it shouldn't appear.
sorry for this issue can you please try this
just enable your payment provide service and go theme customization open product page and enabale
can you please just check theme customization product page product section