[Shippo] Address Validation API Returns Valid Zip Code Even When Invalid Zip Code is Passed

Shippo's Address Validation API returns VALID even for an invalid zip — verified via cURL.

Shippo Address Validation API Costs 6 Cents for Non-US Shipping Addresses

Shippo now charges $0.06 per non-US address for Address Validation API requests — notification recap.

[Shippo] Return Labels with Canada Shipping Address Cannot Be Created with USPS but Can with FedEx, UPS

Shippo Canada return labels require FedEx or UPS — USPS cannot originate a Canada shipment.

[Shippo] Additional Charges Will Be Billed When Shipping Fees Paid to USPS Are Insufficient

USPS via Shippo will now bill surcharges when the postage paid is less than the actual shipping cost.

[Shippo] Unused USPS Labels are Automatically Refunded 30 Days After Creation

Shippo auto-refunds unused USPS labels 30 days after creation, or you can call the refunds API immediately.