Options when creating a [CustomProvider](https://firebase.google.com/docs/reference/js/app-check.customprovider#customprovider_class).

**Signature:**

    export interface CustomProviderOptions 

## Properties

| Property | Type | Description |
|---|---|---|
| [getToken](https://firebase.google.com/docs/reference/js/app-check.customprovideroptions#customprovideroptionsgettoken) | () =\> Promise\<[AppCheckToken](https://firebase.google.com/docs/reference/js/app-check.appchecktoken#appchecktoken_interface)\> | Function to get an App Check token through a custom provider service. |

## CustomProviderOptions.getToken

Function to get an App Check token through a custom provider service.

**Signature:**

    getToken: () => Promise<AppCheckToken>;