"Exception": "{\r\n \"ValidationResults\": [\r\n {\r\n \"ErrorResourceId\": \"Microsoft_Dynamics_Commerce_Runtime_PropertyUpdateNotAllowed\",\r\n \"LocalizedMessage\": \"You're trying to perform an operation that updates a read only property 'SHIPPINGCHARGEAMOUNT'. Either perform a different operation or contact your system administrator.\",\r\n \"LocalizedMessageParameters\": [\r\n \"SHIPPINGCHARGEAMOUNT\"\r\n ],\r\n \"ErrorContext\": \"Property SHIPPINGCHARGEAMOUNT is readonly.\",\r\n \"MemberNames\": []\r\n }\r\n ],\r\n \"ErrorResourceId\": \"Microsoft_Dynamics_Commerce_Runtime_AggregateValidationError\",\r\n \"LocalizedMessage\": \"A validation error occurred.\"\r\n}",
how i can do this? i want to fetch a live rate and push it in cart and charge customer