Therefore, X-cart have released the update patches which will help X-Cart users to update their carts and migrate to the new APIs RateV4 and IntlRateV2.
The USPS API update patches are available for the following X-Cart versions:
4.4.0-4.4.2
4.3.2
4.2.3
4.1.12
4.0.19
Mike B.
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