Hello, I'm configuring my store for USPS sales. I registered with USPS as well as shippingapis.com, but when I test the system I get "Authorization failure. Perhaps username and/or password is incorrect.".
I tried using the userID from both sites in my main settings but nothing works. Am I missing something?
After registering at https://registration.shippingapis.com/ did you get an email with a username and then a bit about switching your profile to the production server - I believe you still need that second step to go live.