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This could be accomplished with xAsset however when it is used to collect funds from an anonymous user it will break the XOOPS registration system. It works fine if the user is already registered. If the user backs out on the payment he will still be a registered user with no email authentication.
Reg_Key an extension of the forumlize project is also useful for this.
Another possibility is the minihaku module which can be found on GIJoes website.
Both reg_key and minihaku do not have payment gateways.
Urging XOOPS to be the Best It Can Be.
Richard......