Make sure payment is accepted

How do I make my form not be accepted if payment is not made? 

As long as the payment field in your form is set as required, not hidden, and/or the total amount is not equal to $0.00, your respondents will be redirected to the PayPal page after they have clicked the submit button.

I hope this helps. If, in any case, I have misunderstood your concern, please feel free to let us know.