Get your Contact Form 7 data straight into SalesKing CRM.
Because of security SalesKing has an advanced session-handling which causes the log-out. If you use the contact form addon you might consider to activate another user in your SalesKing-Account which then "works" as your API-User. Just get in contact with the SalesKing-Team.
Contact-Form 7 is on of the most used contact-form plugins for wordpress and therefore it is very well documented. You can find the docs, FAQ and more detailed information about Contact Form 7 on contactform7.com.