Product listing management, Order Fulfilment in the Flipkart Marketplace.
Flipkart Marketplace API is a free Shopping API that requires OAuth authentication, is served over HTTPS and supports CORS, so it can be called from the browser.

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Seller fee schedules for 21 e-commerce marketplaces and payment processors as JSON
An api to fetch dummy e-commerce products JSON data with placeholder images
Yes. The Flipkart Marketplace API is listed in the Shopping category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Flipkart Marketplace API uses OAuth authentication, so you need to register for credentials before making requests.
Yes. The Flipkart Marketplace API supports CORS, so front-end JavaScript can call it directly.
Yes. The Flipkart Marketplace API is served over HTTPS, so it's safe to use in production.