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Before this PR, we would update the client's FCM token by writing to the putClientSettings HTTPS endpoint. With this PR, we remove that intermediate API layer and write directly to Firestore.

We don't currently use the FCM token, so the main purposes of this PR are to...
* Demonstrate how we'll perform direct Firestore access.
* Demonstrate how to configure the app to use the local Firebase (Firestore) emulator.
* Prepare the application for later use of the FCM token.

Closes #1973

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COVID-19 App

Client CI Server CI

Flutter Dart Java App Engine Firebase

COVID-19 app

Goal Where to go
Where do I get the app? This app is currently only available in Nigeria. If you are from elsewhere you should consult the WHO's COVID-19 website.
How can I help out? We are humbled at the outpouring of support we have received from all over the world and are eager to have you contribute and apologize that we are still in the early process of figuring out how to manage all the contributions. Please bear with us while we organize into smaller teams working in parallel so we can then on-board more volunteers. Until then, please keep filing issues, and fill out the volunteer form here. We’ll get back in touch. You can then read the onboarding documentation.
There's a problem with the app - help! File a report to help us improve. Choose "Bug Report" here.
I have an idea for the app! Choose "Feature Request" here.
How do I build the app myself? See the development guide.
Who can I talk to about product, engineering, or design? Reach out to our functional leads.
How does the app work? See our engineering design documentation.

Development Builds

Please note that if you run the app from the GitHub repository, you are using a development-only build of this app not intended for public use. You agree that you have no expectation of privacy when using this build and understand that the content of the app may not have been reviewed by the World Health Organization.