The Arizona House of Representatives just passed landmark app store legislation in a 31-29 vote on Wednesday that could have far-reaching consequences for Apple and Google and their respective mobile operating systems.

The legislation, a sweeping amendment to Arizona’s existing HB2005, prevents app store operators from forcing a developer based in the state to use a preferred payment system, putting up a significant roadblock to Apple and Google’s ability to collect commissions on in-app purchases and app sales. It will now head to the state senate, where it must pass before its sent to Arizona Gov. Doug Ducey.

The amendment specifically prohibits stores exceeding 1 million downloads from requiring “a developer that is domiciled in…

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