Key TakeawaysShopify beat analysts' third-quarter estimates for operating income, revenue, and free cash flow as sales surged.Operating income soared 132% year-over-year to $283 million, with revenue up 26% to $2.16 billion.The provider of online sales services to retailers anticipates current-quarter revenue will be up by a mid-to-high-twenties percentage. Shopify (SHOP) shares soared to their highest level in nearly three years Tuesday as the provider of online services for retailers posted better-than-an ...