Shopify - Gathering Shipping Methods
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 Shopify:
Login to your Shopify administration panel
Under the Configuration heading, click Settings
Under the Store Settings heading, click Shipping