Reminder mail for payment pending

Hello everybody,

I’m looking for a way to remind customers that their order hasn’t been paid yet (about 2 or 5 days).
It’s even best to have a direct link to the payment page or a link to Paypal (depending on the payment method the customer has chosen). – I get this link already when the payment is pending, but now it has to be sent automatically to the customer after a few days.

I would be happy to receive some answers.
Best regards
David