Most businesses have unique shipping needs that are based on a variety of factors and limitations. Once the Merchant has decided which methods (and/or carriers) to offer, the only thing shoppers need to do is choose a method when they place their orders. As part of the third-party fulfillment setup process a mapping must be created from each available shipping description offered in the e-commerce system to the unique shipping code used by the fulfillment center.
To gather shipping methods from WooCommerce:
From within WooCommerce, click on WooCommerce > Settings > Shipping
The configured shipping methods are displayed. The shipping method that will be sent across is the method ID of the shipping method. For example, the shipping description that will map for Free Shipping is the following method id: "free_shipping."