I just tried to install this plugin and as soon as I clicked Activate, I received a warning banner at the top of WordPress stating a Fatal Error occurred and the plugin could not be activated.

https://www.ads-software.com/plugins/woocommerce-usps-address-verification/

FYI… There is a better link for the USPS API signup

Old: https://www.usps.com/business/web-tools-apis/address-information.htm
New: https://www.usps.com/business/web-tools-apis/welcome.htm

https://www.ads-software.com/plugins/woocommerce-usps-address-verification/