Summary: A new outbound dialing API call api/v2/outbound/contactlists/{contactListId}/clear deletes all contacts in a contact list while keeping the contact list available for references. For more information, see Outbound dialing in the Developer Center and JIRA ticket CD-6050.
Impact: None. This new call makes it easier for outbound administrators to keep their contact lists synced to changes in their databases.
User making this call must have the following permission:
outbound:contact:delete
You may find additional information - including parameters, responses, and code samples - in the Outbound Dialing resources page in our Developer Center.
That is very strange. The API is still there, but it's currently missing from swagger, which is what defines the SDK's methods. You can roll back to the previous version and continue to use that API. I'm investigating internally to find out how the resource disappeared.