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dexcom is the provider slug for Dexcom (G6 and older).
For the OAuth-based dexcom_v3 integration, see Dexcom (OAuth based).
This provider is being phased out in favour of the new OAuth-based Dexcom integration. Consider migrating to the new API at your earliest convinence.

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Enabling Dexcom Share

Your user needs to enable Dexcom Share for this connection to work:
1

Install Dexcom mobile app

They must use the Dexcom G6 mobile app (iOS, Android).Note that the Dexcom Clarity app would not work for this integration.
2

Enable Dexcom Share

Please refer to the official help article on how to enable Dexcom Share.They must have at least one follower[1] on Dexcom Share to keep the sharing activated. Otherwise, the API would stop reporting data to Vital.
[1] You can setup your own Dexcom account for your user to add as a follower in the Dexcom G6 mobile app. Alternatively, your user can invite support@tryvital.io as a follower.
3

Connect via Junction Link

They must connect to Vital using their own Dexcom account — the one which their Dexcom G6 app is signed into. This should not be the accounts of the followers.

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Vital Widget

To connect your device with the widget, follow the link wizard ensuring and enter your username and password. You can also connect a Dexcom user to vital using vital client. For additional information please consult the API reference. 
link_token = client.Link.create(user_id)
client.Link.password_provider(
    link_token, "dexcom", username, password
)

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Webhooks

On successful connection, you will receive a Connection create wehbook. Daily webhooks data.daily.glucose.created and data.daily.glucose.updated will also be issued to your team as new or more up-to-date data becomes available during the day. For this provider however, Vital will begin to aggregate the data for the last 24 hours and will not go beyond that. As a result, there will be no Historical webhooks issued. If you would like to pull the data immediately after connection, you can use the user/refresh endpoint.