Send multiple packages going to the same address with Multi-Piece Shipments

[Shan Lian]

If you haven't checked out our (new) docs yet - we launched multi-piece shipment on the API. 

This lets you group packages going to the same destination together in one shipment to save money. 

Here's the tutorial.

If you're interested, we wrote up a blogpost on how we changed our data model in order to build this feature.