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<filter xpath="not(wso2:vault-lookup('aca_e2t_APIM_KeySecret'))">
    <then>
        <call-template target="aca_e2t_RaiseException">
            <with-param name="ERROR_MESSAGE" value="The password 'aca_e2t_APIM_KeySecret' has not been set in the secure vault!"/>
        </call-template>
    </then>
</filter>
<property name="KeySecret" expression="wso2:vault-lookup('aca_e2t_APIM_KeySecret')"/>
<!-- The lookup can also be used inline -->
<property name="Authorization" expression="concat('Basic ', wso2:vault-lookup('aca_e2t_APIM_KeySecret'))" scope="transport"/>