With YITH Multi Vendor you can turn your e-commerce store into a marketplace (a multi-vendor platform) like Amazon or Etsy. Turn your e-commerce store into a marketplace (a multi-vendor platform) and earn commissions on orders generated by your vendors.
If used with YITH One-Click Checkout, vendors commissions are generated also when the customer purchases through the one-click checkout option.
To enable this integration, just make sure both plugins are installed and activated, then, configure the One-click Checkout as explained on the plugin documentation and the button will appear on every product, vendors’ products included.

For further details about YITH Multi Vendor settings, please refer to the official documentation.