Can a customer apply a coupon during the order review page?

Applying a coupon is typically restricted to specific stages within the checkout process to streamline the user experience and avoid confusion. In Magento, the order review page primarily serves as a confirmation step where customers review their selected products, shipping details, and payment information before finalizing their purchase.

In most configurations, the checkout process allows coupon applications during the cart phase. This is the stage where discounts can be applied, and the total can be recalculated accordingly. Once a customer moves beyond the cart to the order review phase, it is generally not designed for further adjustments to the pricing, including applying coupons. This approach minimizes complications and improves the user flow, ensuring customers have a clear understanding of their order totals before completing the transaction.

The other options imply scenarios that do not reflect the standard Magento checkout behavior or the general best practices for ecommerce checkout flows. Thus, understanding when and where coupons can be applied is crucial for anyone managing or optimizing a Magento store.