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im supposed to do a link in the email. how to make sure that the link can only be accessed once so tat the next time the user click the link, it would pop out the error msg saying that "You have accessed this link before"
if the user is paying by credit card, there's a link to go to the world pay account that allows the user to pay by cedit card but then i reference through the codes and found that a lot of things is required for the person to pay by credit card, like the address, email add n an unique id but then how am i going to provide all these information when it is just a link and not a form.
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