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Register users in Cabinet via integrated system of digital identification.

Endpoints used for integration is described here

Sequence diagram

https://sequencediagram.org

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1. Get AuthRequest from in-memory DB
2. Validate AuthRequest:
   1. if AuthRequest not found - return 401 error
   2. if AuthRequest expired - return 401 error
3. Validate reCAPTCHA token (state):
   1. if invalid - return 401 error
4. Exchange authorization code to access token in id.gov.ua ua (API documentation)
5. Get User Info (tax_id, first_name, last_name, email) by access token from id.gov.ua (API documentation) 

Mithril: Create UserRequest 

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