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Independent shipping plugins
Add-on plugins
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USPS
USPS
Getting started
USPS – How to get access to USPS REST API
USPS – USPS REST API Services
Initial setup
USPS – Adding the USPS Live Rates shipping method
USPS – USPS Live Rates shipping method configuration
Advanced configuration
USPS – Multi-currency support
USPS – Additional costs by Flexible Shipping Table Rate
Troubleshooting & Error resolution
USPS – How to enable debug mode?
Errors
USPS – API Authorization failure. User is not authorized to use API RateV4
USPS – The client application credentials provided in the request are missing, invalid, inactive or not approved for access
USPS – USPS Live Rates: Unable to calculate international postage. No services available
USPS – “Description”: “User Id and Shipper Number combination is not qualified to receive negotiated rates”
USPS – You have USPS shipping methods that are not configured for the REST API
USPS – Authorization failure. Perhaps username and/or password is incorrect.
Other configuration settings
USPS – General Settings
Video tutorials
USPS – Tutorial videos
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