Some data providers don't provide data through a web API, and restrict data access to on-device apps.

See Integrations for a full list of sdk-based integrations.

This means that users cannot agree to share through the widget. Instead, the user has to agree to share data for e.g. Apple Health or Samsung Health on their device directly.

This requires your product to call the corresponding on-device SDK for the data provider (e.g. calling Apple Health and ask for data sharing).

Functions of the SDKs

The SDKs offer two separate functionalities:

Fetch data from providers who restrict access to on-device apps
Make calls to the Terra web API

Pair and Scan FreestyleLibre sensors
We currently support Libre 1 (US/UK/EU), Libre 2 (UK/EU), and Libre PRO/H

Data from on-device providers

Upon successful authentication through completion of a widget session, you will receive the Terra userID and the provider in the customisable redirect URL (this can be a deep link). For on-device data access, you will only receive the provider (and a NULL userID), and will have to trigger the corresponding SDK for the provider on the user device to complete the authentication.

For example, for the Apple SDK:

  • Your application opens a widget session for the user
  • The user selects Apple as a provider
  • Upon completion, you will receive provider=APPLE from Terra
  • You make my application call the Terra Apple SDK
  • The user gets asked by Apple Health to allow data sharing with Terra
  • Each SDK provides native support as well as framework support (e.g. React Native) where possible



In-app API key

Exposing the key in your app is a huge security concern as if your X-API-Key is leaked, a malicious third party could use it to get every user's data under your dev-id!
Having the API key in your app and making calls to the API from the client side should strictly only be used for testing

Authentication on SDKs are done using tokens. You should generate one from your backend and pass this to your application upon initialising a new connection. This makes it so that your X-API-Keys are not exposed in your App.

These tokens are one time use and they expire if not used within an allocated amount of time. Currently this is set to 3 minutes.

Start by generating your first authentication token: Generate Authentication Token