TABLE OF CONTENTS
Paykickstart
Find the customer in the Paykickstart Subscription section, and copy their "Update Billing URL":
Click on the payment method tab
Click on update your billing
And then choose the PayPal tab
And enter your details.
Click on update your billing
And then choose the PayPal tab
And enter your details.
JVZoo
How to change your payment account for JVZoo subscriptions: