GLS is discontinuing its current Shipments WebAPI by 12/31/2026. To keep using GLS from within Xentral after that date, you connect Xentral to the GLS ShipIT Farm API via the new GLS integration.
You can find the GLS integration in Xentral under Settings > Integrations. The article GLS describes how to create the credentials at GLS and store them in Xentral.