I have the Simple Real Estate Pack plugin installed in a WordPress multisite setup. In the settings, you are asked for an API key for your site. Normally plugging in the API key will only work for the blog you entered it. Instead of this, I want to apply one API key for the entirety of the site so that no one else in the network has to register, as they are not very computer literate and probably won't understand what an API key is nor will they want to give our their email to an outside service. What is the best way to go about doing activating one API key for the entire site?