Flipkart Marketplace vs WooCommerce

Flipkart's Marketplace Seller API issues OAuth2 bearer tokens through either a client-credentials or an authorization-code grant, for self-access and third-party seller applications respectively. Its own documentation explicitly requires HTTPS and states plain HTTP requests are rejected, with tokens typically valid for around 60 days before they must be renewed.

WooCommerce's REST API isn't a centrally hosted service — every self-hosted WooCommerce store exposes its own instance, authenticated by a consumer key/secret pair sent as HTTP Basic Auth credentials over HTTPS, per WooCommerce's own documentation. Because CORS support depends entirely on each merchant's own server configuration rather than the protocol itself, it can't be verified as a single blanket property of "the API." The protocol ships free with the open-source plugin; the only cost is whatever the merchant already pays to host their own store.