The enterprise one costs ,300 and lets you use 10,000 users per server, which I assume is meant to say you may use the software on as many servers as you wish.They also advertise an encryption module which may help with transaction processing, but I am not fully sure on that note.

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We Chat is a free Whatsapp-style social networking app, featuring HD video conferencing, QR code invites and a few other interesting features.

With one of these services, you could use any chat software you like, and simply host the chat page on an area of your site that has restricted pay-per-minute access (thus making the chat pay-per-minute).

This would also allow you to integrate pay-per-minute webcam services as well. You can read more about Verotel's pay-per-minute service at: X3 Scripts offers a java script that will handle pay-per-minute access to your web site.

The script does what you are looking for, but the script is not designed to work in time increments less than one day, so it would require some modification to work in minutes instead.

You would want to sell your time blocks as "single item purchases" instead of subscriptions--but still using the IPN--to make this work properly.This is not intended to be a product review or an endorsement of a product.I am only writing to show as one example the kinds of products that are available.Important Disclaimer: Answers and comments provided on Google Answers are general information, and are not intended to substitute for informed professional medical, psychiatric, psychological, tax, legal, investment, accounting, or other professional advice.Google does not endorse, and expressly disclaims liability for any product, manufacturer, distributor, service or service provider mentioned or any opinion expressed in answers or comments.You would own the servers that it resides on, and thus could control security.