Get tracking information for a return order, including a breakdown of packages and the items in each package
Basic authentication header of the form Basic <encoded-value>, where <encoded-value> is the base64-encoded string username:password.
The return order ID to track
Tracking information for the order
The order ID that was looked up
The most recent status across all packages in the order
Array of tracking updates in chronological order
Total number of tracking updates
Array of packages in the order, each containing their line items