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I don't think someone had requested this before, but I have forwarded this thread to our developers as a feature request. We can't promise any timeframe for this, but if there are updates, you should know it via this thread.
Do you mean this website https://gumroad.com/, right?
I would also suggest contacting Gumroad Support and request the possible integration. You can give them our API resource: http://api.jotform.com/docs/.
Thank you for confirming.
I see that Welvin has already submitted your request.
When an update regarding this matter shows up, you'll be notified here.