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GNU Taler v1.0 released
(www.taler.net)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
The same audience as Paypal, which seems to be reasonably popular. Except this is privacy preserving and an open standard that many providers can use.