> For the complete documentation index, see [llms.txt](https://6dot50.gitbook.io/6dot50-apis/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://6dot50.gitbook.io/6dot50-apis/pay-api/authentication.md).

# Authentication

To initiate any calls to the 6DOT50 PAY API, the Organisation's system is required to first authenticate. This is done by calling the [`POST /authentication/getToken`](/6dot50-apis/pay-api/authentication/post-authentication-gettoken.md) operation.

{% hint style="danger" %}

#### Token Expiry 

Tokens expire after 15 minutes and will need to be refreshed before any further calls can be made.
{% endhint %}