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Paste the code to your MyOnlineStore website’s HTML field.
Next, go to your MyOnlineStore 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 MyOnlineStore’s editor. Add it to your page, and paste the Call Button Embed Code you’ve copied before to the HTML field.
Save and update, and that’s it, you should have Common Ninja’s Call Button widget on your MyOnlineStore store.