求翻译：If for any reason you are not happy with your purchase, you may return the items postmarked within 15 calendar days of receipt for an online merchandise credit or refund less the shipping charges. Please return items in original condition (unworn, unwashed, unaltered) with the tags attached. Shoes should be returned with the original shoe box, free of damage and postal labels. Because we cannot be responsible for packages mailed to us, we suggest that you use a trackable and insured mail service. Please allow 2 weeks from the time you mail your order for your return or exchange to be processed. We will email you once your return has been processed.是什么意思？

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