# Calling API with external\_id reply

**URL:** https://meta.discourse.org/t/external-id-api/390573
**Category:** Development
**Tags:** rest-api
**Created:** [December 6, 2025, 7:47am UTC](https://meta.discourse.org/t/external-id-api/390573 "2025-12-06T07:47:04Z")
**Posts on this page:** 1
**Showing post:** 1

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### Author: ![ikaros](https://avatars.discourse-cdn.com/v4/letter/i/bbe5ce/32.png) [@ikaros](https://meta.discourse.org/u/ikaros)
#### Post date: [December 6, 2025, 7:47am UTC](https://meta.discourse.org/t/external-id-api/390573/1 "2025-12-06T07:47:04Z")

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Is it possible to use the `external_id` from SSO to call the API to reply to posts, in order to avoid having to determine the user’s username via `external_id` every time?

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_[View the full topic](https://meta.discourse.org/t/external-id-api/390573)._