Adding a rebate to checkout page

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We have an app we are building that checks our DB through API to see if a product qualifies for a rebate based on a customers zip code and a couple of other criteria, if this customer is eligible for a rebate we send a response back that says how much of a rebate they qualify for and add this rebate info to the checkout page and adjust the cart subtotal.

Currently we have an extension for magento that does this and need to build one for shopify, is this scenario possible and if it is can the app be implemented in to a shopify store at any plan level or does it require a minimum plan level on the seller store side?


Thank you