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USPS – The client application credentials provided in the request are missing, invalid, inactive or not approved for access

The client application credentials provided in the request are missing, invalid, inactive or not approved for access

While being connected to the REST API. Please mind that USPS has two new portals through which you can go onboarding, both look identical, they differ with “developerS” / “developer”:

New – with plural Developershttps://developerS.usps.com/getting-started (We and our users are interested in this one).

Old – with singular Developerhttps://developer.usps.com/getting-started (This one positions first in Google results, but we are not interested in it).

Please ensure that your REST API credentials are created with the first link. Then use them in our plugin. After completing these steps, please verify if the issue has been resolved.

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