Unity game engine need to be linked native Android e-commerce project, with firebase has user registration module

Native Android e-commerce need to be linked with unity 3d

Flow 1

Sign up done / User logged in
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Unity 3d (firebase)
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Product page ( button clicked )
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Native Android e-commerce
Product check out page
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Order details to same firebase database
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Firebase database to unity ( data need to be displayed )

This is the sample flow

Need to create proof of concept