Follow the customer journey

Step	Shopper goal	Required feedback	Recovery
Gallery	Compare products	Clear title, image, price snapshot, source context	Empty/error state
Cart	Review intent	Quantity, subtotal, remove/update controls	Return to gallery
Sandbox approval	Authorize test payment	Explicit Sandbox label and progress	Cancel returns to intact cart
Confirmation	Understand outcome	Status, non-sensitive reference, item summary	Retry only when safe