> For the complete documentation index, see [llms.txt](https://docs.geosamples.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.geosamples.org/api/readme.md).

# Overview

This section is for software that talks to SESAR. The **OpenAPI reference** (next in the sidebar) is the contract: every path, field, and status code. The pages after it are short how-tos for the workflows the spec does not spell out in order.

The production API root is `https://api.geosamples.org/api/`. Send JSON. Writes and private reads need `Authorization: Bearer` plus an access token from [Authentication](/api/authentication.md). Listing published samples does not.

| If you want to…             | Start here                                                               |
| --------------------------- | ------------------------------------------------------------------------ |
| Get a JWT                   | [Authentication](/api/authentication.md)                                 |
| Mint an IGSN                | [Register a sample](/api/register-a-sample.md)                           |
| Search or load one sample   | [Find or fetch a sample](/api/find-or-fetch-a-sample.md)                 |
| Change metadata             | [Update a sample](/api/update-a-sample.md)                               |
| Move off `upload.php` / XML | [Migrating from v1 web services](/api/migrating-from-v1-web-services.md) |
| See every field             | OpenAPI reference, grouped by tag                                        |

Allowed values live in the **Vocabularies** section. What each sample field means, and which ones are required, is in **Metadata Schema**.


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