There is a "Pricing Info" link right below the payment button where I describe meticulously where the money goes. Offering an unlimited trail for an actually commercial product is a standard (and I think very generous) licensing term. Just check out https://www.sublimetext.com.
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Pandoc is not a commercial product. By claiming one must buy a license, you are misrepresenting its actual license. If you're actually selling your own wrapper around it, make that clear.
The pricing info link also sounds dangerously like what other projects have done in the past: "we take the money and put it in a pot, and at some point the author can ask us for the money and we'll figure out how to get it to them". This means users wanting to support the dev unwittingly put the money in a pot the dev has then to go through additional effort and potentially expense to access, which the users would have avoided if they'd known, e.g. through a direct donation. If you actually have clear agreements with authors on how this is going to work, you should emphasize that. If you don't, that should be clear too.
Unless the license of the software you're selling allows you to relicense the software (GPL doesn't, MIT does), this argument is invalid.