Vital Sign-In Token is a new, user-scoped Authentication scheme for Vital Mobile SDKs.
It grants only user-scoped access to your mobile app sign-ins. This allows you to keep your Vital API Keys
as server-side secrets.
We encourage all customers using Vital API Keys in their production mobile apps to
migrate to the Vital Sign-In Token scheme.
Check out the SDK Authentication guide on how to migrate to
this scheme. Check out the Create Sign-In Token endpoint documentation
on how to generate tokens for your mobile app sign-ins.