Yup, pretty easy.
a.) WooCommerce Groups
b.) Groups by itthinx (wordpress.org/plugins/groups/)
Create a product, which is your membership to your site. When a customer buys that product, they are then part of the “Paid Vendors” group or something. Edit your WC Vendors Dashboard pages to allow access only to “Paid Vendors” group. Voila! Magic.
For payments by customers, use PayPal Adaptive Payments, and set it up. Give your vendors 100 for the commission rate and then the money goes directly to Vendors not you (admin). You can also use Stripe Connect & Gateway for the same functionality, too. 🙂