Currently, PA seems to support captchas only via opencaptcha (http://opencaptcha.com.)
While its pretty good, it has two hard-to-overlook drawbacks:
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Reliability: One in ten requests seems to quietly die.
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No HTTPS: It only seems to accept HTTP requests.
But hey! Captchator (https://captchator.com) runs a similar service, less the drawbacks!
Please consider adding Captchator to your whitelist.
Warm Regards,
Greelog.