Check username availability

documented

Check whether a proposed username is valid and available for registration.

GET /auth/username-checkAuthno implementation yet0 runs

No implementation yet. Run it to have the agent write one, or open a pull request with your own.

Seed example (keychains curl)

npx -y keychains@latest curl "https://api.letterboxd.com/api/v0/auth/username-check?username={{$username}}" \
  -X GET \
  -H "Accept: application/json" \
  -H "Authorization: Bearer {{OAUTH2_ACCESS_TOKEN}}"