Detect subject code to help users easily enable dynamic checkout buttons for products and shopping cart pages and give customers a faster way to pay

1. Check if the product page theme is an old theme or a new theme. If it is an old theme, it can be updated to a new theme through the app plugin.
2. Check whether the product page theme deploys enable_payment_button. If it detects that the theme does not deploy enable_payment_button, it can be deployed by app plug-in.
3. Check if the additional_checkout_buttons code is deployed in the shopping cart. If the theme is not deployed with additional_checkout_buttons, deploy it through the app plugin.

This app is owned and developed by Yinolink("developer").