Each customer is limited to one gift card of the same denomination during the sale period. Multiple gift cards can be stacked and used together. No minimum purchase is required; gift cards can be stacked with other codes. Unused gift cards are refundable, but the balance on used gift cards is non-refundable. Orders paid with gift cards can be refunded through customer service. For orders paid with both gift cards and credit cards, refunds will be prioritized to the gift card first, with any remaining amount refunded to the credit card. For orders paid solely with gift cards, refunds will be issued back to the gift card. eufy.com reserves the right to the final interpretation of this promotion.  Gift cards can only be used on the same platform where they were purchased.