Hello, we are WHY2 in the MarketPlace and our USPS extension has been updated to the OAuth requirements since AbanteCart Verison 1.3.4.
You can check it out here:
https://marketplace.abantecart.com/usps_integration
And you can look thru our manual here:
https://why2central.net/docs/usps-overview/
You can check it out here:
https://marketplace.abantecart.com/usps_integration
And you can look thru our manual here:
https://why2central.net/docs/usps-overview/
