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One reservation at a time - promotion ids

Step by step:

  • Repeat for every product where the shopper has a coupon:
    • The shopper scans coupon in-store
    • POS sends a coupon to Liquid Barcodes using Reserve request
    • Liquid Barcodes replies with the promotion id for that coupon
    • POS uses promotion id to add discounts on the relevant product
  • POS takes payment and closes the sale using Validate request

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