Set up discount codes in COD form

Overview

Discount flow should support clean validation and avoid stacking conflicts that break final totals.

Steps

1. Enable discounts feature.
2. Set label, placeholder, and apply button text.
3. Allow one code per order.
4. Validate discount in Shopify test order.

Best practices

• Avoid overlapping promo rules.
• Log invalid code attempts.
• Watch effect on AOV.