1. Open the event’s Vouchers and choose Create campaign.
  2. Set the campaign’s discount and eligibility, review its limits and dates, then save the intended campaign.
  3. Open the campaign to inspect Campaign settings and One-use codes. Generate only the required number of codes.
  4. Use the code-copy action or Export CSV to distribute codes to the intended audience. Treat codes as private offers.
  5. To withdraw an unused code, choose its invalidation action and review the confirmation. Cancel leaves it available; confirmation makes that code invalid.

Each one-use code discounts one ticket once. Use Pause to pause the campaign and Resume to make it active again. Invalidate campaign is broader: after confirmation the campaign and its codes become invalid, and code-generation and pause controls disappear. Review the target campaign carefully before confirming.

Filtering and invalidating a code do not prove a refund occurred or reverse an already completed booking. Check the booking separately.