How do I follow up after a WhatsApp delivery without annoying the customer?

Send one short message after delivery to ask if everything was fine. Keep offers out of it, and send further messages only to customers who agreed to hear from you.

• Wait until the food has probably been eaten. Around an hour after delivery is usually enough.
• Ask one thing only: "Was everything fine with your order?"
• If they reply with a problem, answer at once and fix it. That reply is worth more than any offer.
• If they are happy, thank them. Ask for a review only once.
• Message customers again only if they agreed to receive messages from you.