USPS
USPS Shipping Integration
Willow Commerce integrates directly with USPS (United States Postal Service), enabling businesses to streamline domestic and international shipping processes. From real-time tracking to label generation and address validation, manage everything from one centralized platform.

Key Features
Create & void USPS shipping labels
Instantly generate or cancel USPS labels for domestic and international shipments within the Willow dashboard.
Real-time shipment tracking
USPS tracking updates are automatically synced with your order management system, keeping your customers informed.
Address validation
Ensure shipping accuracy by validating U.S. addresses using USPS-certified tools.
Declared value and insurance support
Add declared value or USPS insurance to protect high-value shipments.
Support for USPS First‑Class, Priority, and Flat Rate services
Access USPS’s full range of shipping options, including cost-effective flat rate boxes and speedy Priority Mail.
Third-party billing
Use another USPS account to bill shipments directly, simplifying B2B fulfillment operations.
Rate and service comparison
View USPS rates alongside other carriers to choose the most efficient and cost-effective shipping method.
Why Choose USPS?
USPS is a government-operated carrier offering reliable and economical shipping across the U.S. and internationally. With special advantages for lightweight items and PO Box delivery, it’s a preferred choice for many eCommerce sellers.
With Willow Commerce, you get full USPS functionality embedded into your operations—automated label printing, shipping updates, smart rate selection, and shipping rule automation—all in one platform.
Top Benefits of USPS with Willow Commerce
Save on lightweight shipments
USPS First‑Class and Flat Rate boxes offer some of the most competitive pricing for parcels under 16 oz.
Deliver to PO Boxes & rural areas
Unlike many private carriers, USPS reaches PO Boxes and remote destinations with ease.
Auto-sync with marketplaces
Integrates with platforms like Etsy, Amazon, and eBay to automatically print USPS labels and update tracking data.
Flexible shipping automation
Define rules for USPS shipping methods based on weight, destination, or delivery speed.
USPS Services We Support
- First‑Class Package Service – Ideal for small packages under 16 oz
- Priority Mail – Fast and affordable delivery within 1–3 business days
- Flat Rate Shipping – Simple pricing regardless of weight or destination
- USPS Tracking – Real-time status updates with tracking number syncing
What You Can Do with USPS Integration?
- Auto-display USPS shipping options at checkout
- Validate and auto-correct addresses to USPS standards
- Print labels with one click directly from your order dashboard
- Enable declared value coverage and add insurance if needed
- Compare USPS rates with other carriers before selecting a service
- Use a third-party USPS account for streamlined billing
USPS integration through Willow Commerce offers a cost-effective, reliable shipping option—especially for lightweight products, PO Box addresses, and small-to-mid-sized brands. It works in harmony with your existing logistics setup, allowing you to combine USPS with carriers like UPS and DHL for a complete fulfillment strategy.
FAQs
Willowcommerce supports Priority Mail, Express Mail, First-Class Mail, and more, giving sellers full access to USPS shipping services.
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