A promotion needs rules and a draw flow, not only a banner

A lucky-draw campaign fails when the customer cannot tell which step they are on. A handsome banner does not fix that.

The minimum flow has:

• A campaign page that states the dates, the rules, and the prizes.
• A join step: scan a code, enter a card code, or open a mini app.
• A spin result or redemption status the customer can see again.
• An operations side that checks valid codes, instead of a spreadsheet in chat.

The live TH true YOGURT campaign page is quatangyogurt.thmilk.vn. The customer reads the instructions, finds the code on the card, and continues in Zalo.