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Actually, you don't need https server to do that, because JotForm is doing it by default. Recently, JotForm completely moved to secure SSL, so you don't need to worry about the secure connection anymore. You can find the detailed post about this feature from the link below:
Also, you find the tutorial about how to create approval form from the following link:
If you want to know more, please let us know.
Please follow up here: http://developers.jotform.com/forum/post/564a245a6c7f9b7c75000079