The biggest UX mistake in e-commerce: discount code input on the checkout page, by Gajus Kuizinas

The Art of Crafting Seamless E-commerce Checkout Experiences

18 Common E-Commerce UX Mistakes You Must Avoid

Promo codes on checkout pages: Pros and cons - Blucadò

How to improve an E-Commerce Checkout Experience: UI/UX Case study, by Shriya Shekhar

5 tips to optimize your checkout page for maximum conversions, by Sanakhan.uxdesign

Chapter 5# Best Practices for Shopping Cart UX Optimization - Aureate Labs

Applying Discounts and Promotions on Ecommerce Websites

12 magento UX design Mistakes to Avoid in M2 Store Design

Applying Discounts and Promotions on Ecommerce Websites

21 expert opinions on ecommerce checkout UX