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Since we do not have integration yet with PushPay, even if you add a link to the form from your payment site, it will have no bearing or effect on the submission data.
What I am saying is, if you put the payment details in your form, there is no means for the informaion data to be transferred to your payment site/processor which is PushPay.
You can also send us a request for the form payment integration to PushPay. You can use this link http://www.jotform.com/contact/ to create a separate post for the request.
Hope this help. Let us know how we can be of further assistance.