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Unfortunately, we currently do not have a support on integrating Ecwid on JotForm. However, I can create a feature request on it and escalate this to our development team. I can't provide an expected date to when this will be implemented or even be considered, but rest assure that they are already aware on this.
For other app integration you can check this page and see if there's something similar that you can use: http://apps.jotform.com/.
I hope this helps.