thanks for replying. I have to find something else maybe like:

Step 1/ visitors submit posts and they register at the same time trough action box.

Step 2/ Admin choose posts to be displaying in the site but does not publish it.

Step 3/ User (former-visitor) is asking to pay.

Step 4/ Admin publish the posts that have been paid by user.

Your plugin is able to perform step 1 and 3 and step 2 and 4 are wordpress standard functions. Is it correct?

thanks