Re: U.S.P.S. Module Docs
The logic is as follows:
1. In the "Store setup" -> "Shipping" -> "U.S.P.S." tab you can enable/disable particular shipping methods. Disabled methods won't show up during checkout.
2. When a customer adds products to cart, X-Cart communicates with USPS servers and retrieves the list of matched shipping options. I'm not sure if I can explain how their servers select the methods. However, if you believe there is something wrong, you can log all request and responses to a log file (as I described above) and analyze the logs.
3. X-Cart removes disabled shipping options from the list returned by USPS and displays it to the customer.
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