Cart, Checkout, Tracking, Referrals

Hi!

We are trying to set up a way to track our successful purchases. We also need to know where the customer is coming from (referral-URL).

Right now we are trying to set up goal that we can track. E.g. we have one goal in place that triggers once someone visits a certain URL, for example “/cart”. And luckily it seems that the referral-URL is already tracked which is great. BUT how can we know/track if the cart checkout button (submit form) is clicked as well?

Is there any way to do this properly with PIWIK?

Thank you.