Getting error: "USPS API Authorization failure. RateV4 is not a valid API name for this protocol" when trying to get real time rates.
I came to know that USPS's TEST server is using the older API method (RateV2), so the testing of RateV4 is not possible with TEST server.
Just move your USPS account to the production server.
I came to know that USPS's TEST server is using the older API method (RateV2), so the testing of RateV4 is not possible with TEST server.
Solution to USPS error:
The solution is very simple.Just move your USPS account to the production server.
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