Enabling OAuth secures the Address Manager API through the use of access tokens issued by the authorization server. An access token represents the authorization of an API client to access the Address Manager API. Once you enable OAuth in Address Manager, you must also enable OAuth on the API client. For example, if you are using BlueCat Gateway, you must update its workflows and endpoints to use OAuth for access to the Address Manager API. Automated scripts must also be updated to use OAuth. For more information, refer to OAuth API Authorization in the Address Manager Administration Guide.