WSO2 Datamapper shwoing not found in postman

Question

I am trying to use data mapper in wso2 and translating the json to xml but it doesn't showing any result instead it showing page not found in POSTMAN.

<?xml version="1.0" encoding="UTF-8"?>
<api context="/TEST" name="TEST" xmlns="http://ws.apache.org/ns/synapse">
    <resource methods="POST">
        <inSequence>
            <datamapper config="gov:datamapper/NewConfig.dmc" inputSchema="gov:datamapper/NewConfig_inputSchema.json" inputType="JSON" outputSchema="gov:datamapper/NewConfig_outputSchema.json" outputType="XML"/>
            <property description="" name="ContentType" scope="axis2" type="STRING" value="application/xml"/>
            <respond/>
        </inSequence>
        <outSequence/>
        <faultSequence/>
    </resource>
</api>

Can anyone help me in this?