Group multiple shipment tracking numbers into a single manifest document that the carrier driver uses to verify packages at pickup.

When to use: Call this endpoint at the end of your shipping batch — typically before a scheduled pickup — to consolidate all outgoing shipments into one manifest for the carrier.

Prerequisites:

• Valid JWT authentication token (Bearer)
• One or more valid tracking numbers from previously generated labels

Key behaviors:

• Returns a manifest ID and a downloadable manifest document URL
• The manifest lists all included tracking numbers for carrier verification
• Some carriers require a manifest (also called "close-out" or "end-of-day") before pickup
• Each tracking number can only belong to one manifest