> For the complete documentation index, see [llms.txt](https://docs.corppass.gov.sg/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.corppass.gov.sg/technical-specifications/corppass-authorization-api-legacy/endpoints/authorization-endpoint.md).

# Authorization Endpoint

Corppass supports OAuth 2.0 authorisation flow, specifically:

* **Authorization Code Flow with PKCE**

The flow returns:

* **Authorization Code**
* **State Parameter**

Refer to the following section for further details:

{% content-ref url="/pages/wci417aokVatVmnkvW9h" %}
[Authorization Code with Proof Key of Code Exchange (PKCE) Flow](/technical-specifications/corppass-authorization-api-legacy/endpoints/authorization-endpoint/authorization-code-with-proof-key-of-code-exchange-pkce-flow.md)
{% endcontent-ref %}