Purchase shipping for non-Prime and Prime orders using Amazon’s Buy Shipping Services.
With the Selling Partner API for Merchant Fulfillment, you can build applications that sellers can use to purchase shipping for non-Prime and Prime orders using Amazon's Buy Shipping Services.
For more information, refer to:
Note
For new integrations, use the Shipping API v2 instead.
FBM Ship+ program availability
For a list of marketplaces where the FBM Ship+ program is available, refer to FBM Ship+ program availability.