How to Create Buttons on Contact and Product via REST api

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Need help in creating button from Rest API on Customer and Product.

I have created an app to show some data related to Customer and Product.

When the app installed in any Shopify store then I want two buttons auto created at the time of app installation on Customer and Product page, when anyone click on these buttons the user will redirect to the installed app with customer/product id as URL parameters.

How can I achieve this?

Thanks