# Sources — Shopify

- [Shopify Checkout Extensibility](https://shopify.dev/docs/api/checkout-ui-extensions) — official_docs, Shopify (primary), checked 2026-04-18
- [Shopify Pricing](https://www.shopify.com/pricing) — official_pricing, Shopify (primary), checked 2026-04-18
- [Shopify Terms of Service](https://www.shopify.com/legal/terms) — official_terms, Shopify (primary), checked 2026-04-18

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