What is the Partner API?
The Partner API allows ShipEngine customers to white-label the API. You can create ShipEngine accounts for your customers and make ShipEngine API calls on behalf of your customers.
What does it do?
The Partner API only has a few endpoints for creating and managing ShipEngine accounts. Everything else (such as creating shipments, purchasing labels, tracking packages) is done via the public ShipEngine API on behalf of those accounts.