Thanks for putting me in the right direction mentioning condition logic, it works fine now!
For everyone who wants to know what I did:
– added a checkbox to the form, parameter name TYPE, only value name CHANGE, and allowed it to be populated dynamically
– hide this checkbox by CSS
– told sticky list that my form was on page …/?TYPE=CHANGE (so added the parameter and value of the new checkbox to the URL)
– told the form to only redirect to the payment gateway if TYPE is not CHANGE
– hide the payment fields if TYPE is CHANGE
Thanks again for you fast reply and hint!
