Optimize the checkout and payment UX for [E-COMMERCE/SAAS]. Provide: single-page vs multi-step checkout (recommendation with reasoning), form field optimization (minimal fields, smart defaults, autofill), payment method presentation (card, PayPal, Apple Pay, BNPL), trust signal placement, error handling (inline validation, friendly messages), mobile checkout optimization, express checkout flow, order summary design, confirmation page and email, and 10 A/B tests to improve checkout conversion.
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