User Payment

Hello,

A user bought one of my posts, then complained that the hidden content didn’t show. I noticed that his user ID was not added automatically by the plugin to the list of purchasers. When i went to the purchasers settings of the post and tried to add him, I got the error:

ihabsarieddine.com 403 Forbidden Error Page

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Please advise.

http://wordpress.org/extend/plugins/are-paypal/