The "Get your National Insurance number by post" service allows unauthenticated users to get HMRC to send them proof of their National Insurance number by post. This is an alternative to similar functionality in the Personal Tax Account, for users who cannot pass identity verification.
This service does not rely upon any other microservices, beyond standard platform services (e.g., audit, contact, etc.).
At the end of the journey, the user is able to download a PDF of their answers to print and send to HMRC.
This code is open source software licensed under the Apache 2.0 License.