> Fetch clean Markdown by appending `.md` to any page URL under https://signalwire.com/docs or requesting it with the HTTP header `Accept: text/markdown`. The root index at https://signalwire.com/docs/llms.txt lists the available documentation indexes.

# SDKCredential

> Authentication credentials for the SDK.

Authentication credentials for the SDK.

At least one of `token` or `authorizationState` must be provided.

## **Properties**

**`authorizationState`** `string`

Pre-authorized session state (alternative to token).

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**`expiry_at`** `number`

Token expiry timestamp in milliseconds since epoch. When set, the SDK attempts credential refresh before expiry.

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**`token`** `string`

JWT subscriber access token (SAT).

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> Authentication credentials for the SDK.