Invoke Form submit automatically from within controller

[eluser]tkaw220[/eluser]
Hi,

I have a case where I need to invoke form action from Controller.

Said I have a page for customer to review their order summary, when they click on the "Place Order" button, the browser post some hidden information to a function in my controller which tell model to insert information into database, if data injection completed successfully then the Controller invoke the form action automatically and post those posted hidden information from last form to internet payment gateway.

Any example how I could achieve this?

Billion thanks.