Only one time access to the page

[ELMIT]

I am not sure how I should name it ;-(

I try to sell something, where I issue first a ticket number, and the IP address, date and time. The customer select the items and want to pay.

The payment is done via Clickbank.
After payment Clickbank transfers the customer back to a certain home page on my site, whereby ticket number, item and IP address is still attached. Additional Clickbank adds a uniq transaction code.

After it comes back the customer can add a number, email and name to the form and get a password.

The entries are checked, and if not correct, the customer will be pointed back to the previous page.

The password will be sent by e-mail to him.

During the tests I figured out that he can always go back to enter another number and could get ALL passwords.

I need to make sure, that the primary ticket number allows only one entry of the number. How can I make this?

[planetsim]

I dont quite understand your Ticket number. Is it coming from a database. Is it made randomly. You gotta be more specific.

If its done by database

id say that you can do something to see if it already exists.

say the ticket number was 100 and 100 was in the database

we'd do this
$result=mysql_query("SELECT * FROM tbl_name WHERE ticket_no='$ticket_no'");
$rows=mysql_num_rows($result);
if($rows != 0)
{
ticket already made
}
else
{
not made
}

[Rohan_Hill]

Originally posted by ELMIT
I need to make sure, that the primary ticket number allows only one entry of the number. How can I make this?

Just have a data file which stores all the ticket numbers which have been used, and then when a user enters a ticket number, just see if that one's in the file.