I want to setup a new website with Wordpress. The information the customer can get is a combination of two separate websites (which websites can not be told at this time). For the main website there is already a Wordpress plugin available. With this the customer can search by various filters and get a result-list. The items in the result-list have all a key-indicator (i.e. city-name) which needs then to be enhanced by additional information from another website (look for city and get i.e. numbers of inhabitants).
A membership functionality needs also to be possible with payment functionality to grant the customer access to the information.
The setup of the Wordpress website with the plugin should not be a problem. The linkage of the two websites is the main part.