# User Authentication by User Name

{% openapi src="<https://544392450-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F909t04Fk8FiEI7fBcmlw%2Fuploads%2Fgit-blob-0a6a293d0a6cdb3b172f2d2f3cb550af3be41315%2Flogin-api-public.yaml?alt=media>" path="/pubkey/app/username/{username}/authenticate" method="post" expanded="true" fullWidth="true" %}
[login-api-public.yaml](https://544392450-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F909t04Fk8FiEI7fBcmlw%2Fuploads%2Fgit-blob-0a6a293d0a6cdb3b172f2d2f3cb550af3be41315%2Flogin-api-public.yaml?alt=media)
{% endopenapi %}

> #### 📘 Requirements
>
> The app must have been created on the pod.\
> The app must be enabled.\
> The user must exist and have the app installed. For more information, refer to [Update user Apps](https://rest-api.symphony.com/main/apps-entitlements/partial-update-user-apps).