The short answer
TikTok Shop pays creators commission on every product they sell through shoppable videos, LIVE, or their showcase storefront. The Affiliate Program is free to join, doesn't require any inventory investment, and takes 15–30 minutes to set up.
If you've got 1,000+ TikTok followers, are 18+, and live in a supported market, you qualify. Most creators hit $500/month within 60 days of joining by posting 3–5 shoppable videos per week.