I'm sure its possible, but is there a concrete5 set method/technique to send a private message via php from one user to another without using a form. Front end process is click a button, which will send a message from one user to another.

One way I thought of was to manually insert into the database table (UserPrivateMessages and UserPrivateMessagesTo). Would this be the correct way of doing this or will I run into some issues?

Using 5.6