java - Using backend service providers with standalone applications -

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i developing restaurant pos & ordering system college project, i'm hoping develop standalone java/c# (still deciding) app serve pos , adding menu items + android app waiters take orders customers.

i'd connect these 2 apps , backend i'm looking integrating firebase or back4app since parse being discontinued, choice?

i'd pointers on how set database connection internet based backend service provider firebase or back4app standalone application.

please feel free suggest other possible routes take connect these 2 apps together.

thanks!

the firebase realtime database component includes java server sdk , rest api used integrating standalone application.

there java sdk documentation here:

https://firebase.google.com/docs/database/server/start


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