woocommerce – POD provider or supplier ecommerce store

We are printing suppliers looking to set up a Print on Demand eCommerce store similar to Printify or Printful. We are looking for the below features

  1. Seller or drop shipper registration
  2. Each seller can add products from our catalog to their account
  3. Each seller can integrate with their own store (Shopify or WooCommerce store)
  4. Seller should be able to automatically send orders from their Shopify store to our website.
  5. we should be able to send/sync product catalog to their store

Basically, we are looking for a fulfillment e-commerce solution for POD dropshipping supplier.