As these are digital products with immediate access to content, exchanges or substitutions are not available. A full refund may be requested within 7 calendar days of the purchase date, as provided under Art. 49 of the Brazilian Consumer Protection Code (right of withdrawal). To request a refund, please contact us at contato@orientehistory.com with your full name and the email address used at checkout. The amount will be returned to the original payment method within up to 10 business days after the request is approved. Refund requests submitted after the 7-day period will not be accepted.