By accessing or using hceis.com, you agree to be bound by the following terms:
1. Operating Entity: The e-commerce functionality and payment settlement services of this website are provided by Valtaryx LLC (Registered in Delaware, USA). Valtaryx LLC is the merchant of record for all transactions.
2. Order Fulfillment: Physical book supply, quality inspection, and international shipping are fulfilled by our strategic partner, China Scientific Book Services Co. Ltd.
3. Payment Terms: We accept international credit cards (Visa, MasterCard, American Express, etc.) and PayPal, processed via Valtaryx LLC. For institutional buyers, bank transfers (SWIFT) are also available.
4. Returns and Refunds Policy: All refund requests are reviewed and processed by Valtaryx LLC. Please notify us within 14 days of receipt to initiate any of the following processes:

• Damaged or Defective Goods: If the goods received were damaged in transit or are defective, please contact us to request a Return Authorization.
• Partial Availability: If you order multiple books and we are unable to supply part of them, a return or refund will be issued for the unavailable portion.
• Duplicate Payments: In the event of a repeat payment (paying for the same order more than once), please contact us to obtain a full refund of the duplicate amount.
• Incorrect Supply: If an item was incorrectly supplied, you may request a refund or ask us to resend the correct item. Please specify your preference when contacting us.

5. Governing Law: Disputes regarding payment and settlement are governed by the laws of the State of Delaware, USA. Disputes regarding physical trade and logistics shall be governed by international commercial customs and the relevant trade laws of the People's Republic of China.