Shopify app plan/charge currency

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Hi there!

I am developing an app that have a free and a premium plan. I am little bit confused about the currency of the app plan charges. What currency will be used for charging the merchants will it be shop native currency(which can be retrieved by the Shop api) or is it set to USD for all app charges? 

For example if i define my app's premium plan price to be 10 will it be 10$ or 10 in whatever currency merchant has selected on the store?

My apologies for the noobish question this is my first app and i couldn't find any related documentation for help or maybe i am just not able to find it lol.