JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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You need to authenticate your Stripe account first to be able to integrate. Use that blue button 'Connect with Stripe' to launch the Stripe login screen.
I just test it on my form using my Stripe account and it work just fine. You can see in the image blow that my Stripe connect link now shows 'Connected!'
Make sure also that your are providing a valid Stripe account username and password.
Please retry the process again.
Let us know if you are still not able to connect. It will help also if will provide us with the steps taken when the integration failed.