Decision 01
Single-screen checkout with saved defaults
Multi-step mobile checkouts ask for the same details again and hide the total until the end.
Considered
A classic stepper of address, delivery, payment and review.
Chosen
One screen with address, delivery and payment as editable rows, and the total pinned above the pay button.
Why it works
Returning shoppers pay with one confirmation. New shoppers expand each row, which is slightly longer for them but clearer for everyone.
