I am testing out the USPS shipping option and can’t seem to make any progress. I signed up for an account at USPS and they sent me these two URL’s to send test calls to.
I also added my user ID in the USER ID field in the system configuration. However, I always get this error when trying out the shipping estimator on the view cart page. “* Response is in the wrong format”
Has anyone successfully integrated the USPS shipping method? If so, what am I doing wrong.
Any help would be great.