call external web service from WSO2 ESB - wso2

Question

I'm in an internel network and I want to create a service (ESB) to call an external get service.
for example my ESB service path: uri/esb/path/param1/param2
my external path: external/path/param1/param2
here my entry
<?xml version="1.0" encoding="UTF-8"?>
<api context="/services/KRI-getIndividualVehicleFuelco2" name="KRI-getIndividualVehicleFuelco2" xmlns="http://ws.apache.org/ns/synapse">
<resource methods="GET">
<inSequence>
<property name="renault_error_format" scope="default" type="STRING" value="json"/>
<log level="custom">
<property name="getIndividualVehicleFuelco2" value="********** begin **********"/>
<property expression="get-property('RequestID')" name="RequestID"/>
</log>
<Delegation.DelegationIn>
<Jboss-Endpoint-Key>KRI-customAddressingTransformation.xml</Jboss-Endpoint-Key>
<Custom-Sequence-Header>KRI-commonsequences-processSpecialHeadersIn</Custom-Sequence-Header>
</Delegation.DelegationIn>
<loopback/>
</inSequence>
<outSequence>
<sequence key="KRI-commonsequences-genericErrorHandling"/>
<Delegation.DelegationOut>
<Jboss-Endpoint-Key>KRI-customAddressingTransformation.xml</Jboss-Endpoint-Key>
<Custom-Sequence-Header>KRI-commonsequences-processSpecialHeadersOut</Custom-Sequence-Header>
</Delegation.DelegationOut>
<log level="custom">
<property name="getIndividualVehicleFuelco2" value="********** end **********"/>
<property expression="get-property('RequestID')" name="RequestID"/>
</log>
</outSequence>
<faultSequence>
<loopback/>
</faultSequence>
</resource>
</api>
I created an endpoint with the base uri of the external service.
<?xml version="1.0" encoding="UTF-8"?>
<endpoint name="KIS-fuelco-PPD" xmlns="http://ws.apache.org/ns/synapse">
<address uri="http://kisre701.intra.com/kis/api/v2/individual-vehicle-fuelco2/"/>
</endpoint>
how can I parse parameters and send them to endpoint?