• Post-Billing Adjustments
• Available Service and Confirmation Types
• USPS First-Class Large Envelope/Flats and Letters
• USPS Domestic Service Details
• USPS Domestic Package Sizes and Dimensions
• USPS International Service Details
• Duties and Taxes for International Shipments
• USPS Cubic Rates in PayPal Shipping Center
• UPS in PayPal Shipping Center
• UPS Additional Handling
• Carrier Service Suspensions and Alerts
• DHL Express in PayPal Shipping Center
• USPS Rate Changes 2025