If your store integrates with calculators for shipping services, you can specify internal shipping methods that will be offered to shoppers when Commerce Cloud cannot connect to external shipping service’s web service, for example, in the event of an outage. The fallback shipping methods are displayed on the storefront during the checkout process. This prevents errors during order processing and allows orders to progress to the next step.

You can mark any number of shipping methods as fallbacks. You might want to create a fallback method for each type of shipping method you expected to receive back from the external shipping service.

See Integrate with External Shipping Calculators in Extending Oracle Commerce Cloud for more information about configuring when Commerce Cloud uses a fallback shipping method.