To add the PayPal Smart Button to your Shopify store, follow these steps:
1. Log in to your Shopify admin panel.
2. Go to the “Online Store” section and click on “Themes.”
3. In the “Themes” page, click on “Actions” and select “Edit code” from the drop-down menu.
4. In the “Layout” section, locate the “theme.liquid” file and click on it to open it.
5. Scroll down to the bottom of the “theme.liquid” file and paste the following code just above the closing