Seems I needed this at the same time as other ProcessWire devs. Timely!
This module is simply a ProcessWire module wrapper for the PayWhirl API and being the initial release, may have a few unforeseen hiccoughs. Please be gentle with me when reporting any problems.
As with all API's make certain your ducks are all lined up with the vendor first, in this case PayWhirl -https://app.paywhirl.com/
Download the module from GitHub at https://github.com/clipmagic/PayWhirlAPI
Download the module from ProcessWire modules at http://modules.processwire.com/modules/pay-whirl-api/