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Sending json string within xml payload

Assuming we are getting the following request to the WSO2 ESB.

Request:
{
"establish": [{
"customerId": "6666634324",
"serviceTransactionID": "TOA157934",
"displayText": "Transfer from HNB to NDB",
"milestonesDef": {
"Transfer-Started": "You have started the transfer",
"Transfer-Initiated": "You have submitted the transfer",
"Transfer-Processing": "Processing your request",
"Complete": "Transaction Complete"
}
}]
}
view raw JSON_payload_1 hosted with ❤ by GitHub
I want to generate the following xml payload which contains json string and send it to the backend.

<dat:EstablishMilestone xmlns:dat="http://ws.wso2.org/dataservice">
<dat:customer_ID>6666634324</dat:customer_ID>
<dat:serviceTransaction_ID>157934</dat:serviceTransaction_ID>
<dat:milestone_def>{"Transfer-Initiated":"You have submitted the transfer","Transfer-Processing":"Processing your request","Transfer-Started":"You have started the transfer with Vanguard","Complete":"Transaction Complete"}</dat:milestone_def>
</dat:EstablishMilestone>
view raw XML_payload_1 hosted with ❤ by GitHub
Here's the sequence:


<sequence name="sample_sequence" onError="fault_sequence" trace="disable" xmlns="http://ws.apache.org/ns/synapse">
<!-- store required JSON content to a variable -->
<property name="JSONPayload" expression="json-eval($.establish[0].milestonesDef)" />
<log level="full">
<property name="====JSONPayload====" expression="$ctx:JSONPayload"></property>
</log>
<!--
{
"Transfer-Initiated":"You have submited the transfer",
"Fidelity-Processing":"Fidelity processed your request",
"Transfer-Started":"You have started the transfer with Vanguard",
"Custodian-Processing":"Vanguard is processing your request",
"Complete":"Transaction Complete"
}
-->
<!-- construct the xml message with JSON content-->
<payloadFactory media-type="xml">
<format>
<dat:EstablishMilestone xmlns:dat="http://ws.wso2.org/dataservice">
<dat:customer_ID>$2</dat:customer_ID>
<dat:serviceTransaction_ID>$1</dat:serviceTransaction_ID>
<dat:milestone_def>$3</dat:milestone_def>
</dat:EstablishMilestone>
</format>
<args>
<arg expression="//jsonObject/establish/serviceTransactionID" />
<arg expression="//jsonObject/establish/customerId" />
<arg expression="$ctx:JSONPayload" />
</args>
</payloadFactory>
<!-- convert message to xml --->
<property name="messageType" value="application/xml" scope="axis2" />
<send>
<endpoint key="backend_endpoint"/>
</send>
</sequence>
view raw WSO2_config_11 hosted with ❤ by GitHub

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