Shopify has momentum, but its valuation is steep. Here's what needs to go right for the rally to continue.Shopify (SHOP +2.17%) stock had a strong year that briefly included a new all-time high. Growth rates remain impressive and can power the stock to new highs in 2026 if consumer spending remains resilient.The company has a digital ecosystem that gives it an edge over other e-commerce platforms. These are some of the catalysts that could propel Shopify's stock in 2026. Merchant sales are a significant tai ...