How do make a private app to check zip code for products like shopify Advanced cash on delivery

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I am new to Shopify development, we have products to restrict in the particular Pincode based availability check, we used Advanced cash on the delivery app by Shopify, which exactly is possible to create a private app to check the pin code or zip code for the product availability check ( Shopify plan is Basic), we can't access the checkout page code.   Kindly give your suggestion for making a private app for same as COD checker by Shopify


I appreciate your help. Thank you in advance.