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Just came across this new site which handles subscriptions, it's modular based so you have to buy the DB mapper also, but it looks to support XOOPS and they confirmed this.
Click here for AgilecoI believe they renamed themselves from Dreamaccount.
This is not a XOOPS module though, but they claim it works with XOOPS groups and many payment options with many currencies.
If any one tries it let me know how it goes.