TikTok is planning to launch its in-app shopping platform in Spain and Ireland as early as October, restarting a stalled campaign to expand its fastest-growing business in Europe.ByteDance Ltd.’s social media startup told partners including merchants and creator agencies in recent weeks to get ready for a TikTok Shop debut in the two countries, according to people familiar with the matter. The rollout will be smaller than previously envisioned although preparations are underway to bring the port...