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Developing a custom shopify app to add recycling fee in the checkout page based on the customer loc

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I have developed a rough interface in my Shopify app. I want to know the process of interacting app and checkout page. After I set the state and fee for a  particular product it should appear on the checkout page when the customer selects the state. for example, if a customer purchases a T-shirt from my store and his/her state is NY recycling fee should appear on the checkout page with the related fee and it should be added to the total.  If someone knows please help me.




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