To configure Delivery Managers, go to Shipping Manager Setup-> Setup Delivery Managers or search for "Delivery Manager".
Define a Delivery Manager, in "Code", and state the same code in "Delivery Manager Name". It is important that these are exactly the same. You can add as many as you want.
Depending on the connection type to the 3'rd party, different additional fields will be shown.
With "Connect via Rest Api" feature enabled
In Connector Type, chose which Connector type should be used for this Delivery Manager Code.
In "Send Waybill Code" an Data Webhook Setup is selected or created, for the data exchange.
Mapping of External keys for Shipping Agens and Shipping Agent Service in Shipping Agents for Delivery Manager
See article about the mapping here: https://abakion.zendesk.com/hc/en-us/articles/9375626868636-Mapping-of-External-keys-for-Shipping-Agens-and-Shipping-Agent-Service-in-Shipping-Agents-for-Delivery-Manager-