I do come across many sites that teaches how to create a link that expires. I decided that once a person registers and if successful the person will be taken to a thank you page. In that thank you page, the person will be introduced to a one time offer. In the one time offer the person is required to fill in some information and if successful the person will be taken to an acknowledgement page. Now the one time offer can only be performed one time only. So what is the best way of making sure that the person sign up for the one time offer only once?

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