We would like to offer the discounted shipping cost we get from Stamps.com to our customers. For example a customer pays $7.05 in Shopify for shipping and Stamps.com charges $5.84 for the postage. How can we get the Shopify stores to pull the actual Stamps.com rate? We don't want to have a blanket adjustment for the shipping, as it varies from order to order and we can't just pick a definite pecentage to mark it down.
You can use the Multi Carrier Shipping Label app that will help you integrate your stamps.com account with Shopify and allows you to display the rates that your stamps account provides.