i have a php application where users can apply for a bonus. but there is a confirmation page before the bonus redemption code runs. the issue is that in IE, if you hit f5 right after you click the continue button, the confirmation page refreshes while the bonus redemption code had already been triggered by the continue button and actually goes through. but because the user still sees the confirmation page, they would hit the continue button again and now they get an error cause they are already registered.
any input will be appreciated.