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How to read request parameter in WSO2 ESB 4.8 or higher?

I have a resting endpoint in WSO2ESB (4.8), I need to read the query parameter in order to set the dynamic payload as my company. But I could not read it due to a newer one using wso2 ESB.Any?

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Below is the code below.

<api xmlns="http://ws.apache.org/ns/synapse" name="sample" context="/api/sample">
   <resource methods="OPTIONS GET" uri-template="/{val1}/groups/{val2}.json?q1={v1}&q2={v2}">
  <inSequence>
     <property name="uri.var.q1" expression="$url:q1"></property>
     <property name="uri.var.q2" expression="$url:q2"></property>
     <property name="uri.var.val1" expression="get-property('uri.var.val1')"></property>
     <property name="uri.var.val2" expression="get-property('uri.var.val2')"></property>
     <send>
        <endpoint>
           <http method="GET" uri-template=""></http>
        </endpoint>
     </send>
  </inSequence>
  <outSequence>
     <send></send>
  </outSequence>
  </resource>
</api>
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Define a REST API inside the ESB and access the request parameters using get-property ('query.param.xxx') or get-property ('uri.var.yyy'), sample:

<resource methods="GET" uri-template="/testwso2/{symbol}?arg1={value1}">

get-property('query.param.arg1')
get-property('uri.var.symbol')
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