You need to have Account Segregation purchased and installed on your Freelance Marketplace in order for the Seller Notifications extension to work
Offer your sellers to subscribe to email (or sms) notifications for new Buyer Requests published within the categories of their interest and expertise, as well as within certain location.
Subscribing to notifications from the front-end is very straightforward:
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Seller Notification plugin is included in ENTERPRISE License. Buy Enterprise