Paste the code to your Shift4Shop website’s HTML field.
Next, go to your Shift4Shop store editor and find the HTML field. It is most likely in the form of an HTML/Code widget or module which you can find on the Shift4Shop’s editor. Add it to your page, and paste the Timeline Embed Code you’ve copied before to the HTML field.
Save and update, and that’s it, you should have Common Ninja’s Timeline app on your Shift4Shop store.