When you dine at any participating location, just present your linked credit or debit card when you pay to get Plenti points. You don't even need to show your Plenti card.
Note that you cannot pay with a mobile payment app or digital wallet like Apple Pay, Android Pay or Samsung Pay and receive Plenti points for Plenti Local Dining. In addition, you can’t pay using your debit card PIN with Local Dining. However, you can link and use a prepaid debit card.