Do the following:
1. Create users for each client
2. Additional Buttom chatting to your application
All in a single database, which is its only drawback is that the online messaging and only comes to the administrator.
I hope that if there are problems for the translation can communicate directly with me by mail.
SUPPORT MUST BE TIMELY BY THE DEVELOPERS, WE MUST UNDERSTAND THAT PAYMENT FOR KEEPING THE PROJECT, AND IN DIFFERENT WEBSITE IS AN APPLICATION ON PRODUCTION AND IS CRITICAL.
I think NO SUPPORT WEBIM