Shopify change history: UPS shipping rates not available at checkout

Some Shopify stores displayed no UPS shipping rates at checkout, potentially preventing customers from completing orders. The vendor rated the incident major; it started at 2019-11-08 04:15 UTC and was resolved at 2019-11-08 07:44 UTC, lasting 3 h 28 min. Shopify recommended adding rates from other carriers while UPS worked on a solution.