Is there a way to create a digital signature when submitting a form in formcentral?
Sorry it is not possible. You can vote for the idea here : http://forums.adobe.com/ideas/1462
You can also create a PDF form with FormsCentral and then use EchoSign (https://www.echosign.adobe.com/en/home.html). This workflow wouldn't collect data in FormsCentral though.
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