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The most challenging part of building this app was definitely the part where we had to integrate it with the beacon technology. We had to work with a few beacon providers and make sure that we can properly integrate our system with their SDKs. At the end of the day, the beacons had to work with great accuracy for the best user experience within the app.
Besides this, the integration of the location APIs should not interfere in any way with the entire flow accessing the content of the app. The user flow had to be as simple as possible, whilst still useful to the end user.