Create a New product by Magento REST API, you need first to generate an access token. The access token is used to create a product in the admin panel. Check the link for Generate Access Token Magento 2
Once you got the Access Token for Magento, You can call REST API for creating a product from a third-party system.
Continue reading “Create a product by REST API /V1/products programmatically in Magento 2.”