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I am building an Etsy like online marketplace. To do so I am using several wordpress plugins. These include Marketplace plugin on a multipress site with a frontend plugin to hide the standard wordpress dashboard from shop owners. I am also using a a plugin called pro sites to setup a subscription price that members have to purchase to list more than 10 items on our market place. I need the plugin altered so that when a non paid shop owner goes to list an 11th item it prompts them to purchase a paid plan.