[Home](./index.md) > [ibm-cloud-sdk-core](./ibm-cloud-sdk-core.md) > [Authenticator](./ibm-cloud-sdk-core.authenticator.md) > [authenticate](./ibm-cloud-sdk-core.authenticator.authenticate.md) ## Authenticator.authenticate() method Augment the request with authentication information. **Signature:** ```typescript authenticate(requestOptions: AuthenticateOptions): Promise; ``` ## Parameters

Parameter	Type	Description
requestOptions	AuthenticateOptions	The request to augment with authentication information.

**Returns:** Promise<void> ## Exceptions Error: The authenticate method was not implemented by a subclass.