Why are most Bitcoin payment invoices time limited ?

Why are most Bitcoin payment invoices time limited ?

Most bitcoin payment gateways issue time-limited payment invoices. Why is that ? AFAIK, the address stays valid even after the timer is out. For instance when sending a transaction from wallet to wallet, even if I send to that address after the 15 minutes, the recipient still gets their money. I have tried this with at least 3 wallets. In this case, what's the timer for in the first place if the address is still linked to that user ?

Thanks.

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