What should I do when one customer sends many messages for a single WhatsApp order?

Wait until they stop typing, then send one summary of the items, address and total and ask for a single "yes". Use that one message as the order, not the earlier pieces.

• Do not answer each message. Wait a minute, then reply once, so the chat does not get longer.
• Write the order as a short list and ask: "Is this correct?" Only start cooking after a yes.
• If the customer changes something later, add it to the same list and send the updated list again.
• Save a quick reply with a simple order format, and send it to customers who tend to type in pieces.
• Label the chat "Order in progress" so staff know it is being handled.