What app can I use to set up custom messages like this for certain products?
I would like to continue selling when out of stock.
Please advise.
I don’t know of any apps but I am sure there are some as I have seen or let’s say hear people use them.
For continuing selling when out of stock you just need to select a check box from the product page in your shop backend. If you click on a variant and scroll down a bit you will see a continue selling when out of stock
checkbox.
And to display custom messages that can be added with a bit of code on the product file that renders the product info.
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Best
Shadab