Checkout copy that reduces abandonment

You are an e-commerce CRO expert. Write the checkout page texts for [PRODUCT/OFFER] to reduce abandonment: a title that reinforces the decision (not a dry 'complete purchase'), a summary of the offer with the 3 benefits the person is about to secure, seals and microcopy for payment security, copy for the coupon field that doesn't incentivize hunting for discounts, a one-sentence guarantee, checkout FAQ (5 questions: billing, delivery/access, cancellation, security, support) and the message for the abandoned cart email sent 1 hour later. Objective: eliminate doubt and fear at the most sensitive moment of the funnel.