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

# Service Authentication API

Register your service on [Entity Studio Developer Dashboard](/hypersign-developer-dashboard/developer-dashboard.md) and generate your API secret Key before proceeding. 

Once the API secret key is generated, you can use the API below to generate a new access token. Just pass your API secret Key in `X-Api-Secret-Key` header to generate access token. The `access_token` is required to access all SSI APIs. Read the next section for more details. 

{% hint style="info" %}
Entity Studio SSI API base URL: <https://api.entity.dashboard.hypersign.id/>
{% endhint %}

{% openapi src="/files/vgw0vjv4rN8E1Tf2vbDp" path="/api/v1/app/oauth" method="post" %}
[api-json.json](https://1497651738-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MOLDOibYYcG4PCSEDDL%2Fuploads%2FjYVydJufhHpdtxi9oslY%2Fapi-json.json?alt=media\&token=695305b2-cc3b-400b-9c46-54606891a2d7)
{% endopenapi %}

Once you generated the `accessToken`, you can pass this token as *<mark style="background-color:yellow;">bearer authorization token</mark>* in the header for all APIs.&#x20;

{% content-ref url="/pages/u8XWTiyGTIJULYI41CYW" %}
[Generate AccessTokens](/hypersign-id/id-widget/integrations/backend-integration/generate-accesstokens.md)
{% endcontent-ref %}