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Occasionally, third party shipping apps might experience downtime, during which time they won't respond within 10 seconds. This can lead to a loss of sales because your customer checkouts might fail, and customer's might not complete their order as a result. In these cases, backup shipping rates are displayed to customers so that they can complete their purchase.

You can add backup shipping rates from your Shipping and Delivery settings.

Learn more about backup shipping rates in the Shopify Help Center.