feature: payload to Query String

sample-sharedflows/SF-PayloadToQueryString/README.md

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+## USAGE
+
+**create flow callout policy in your proxy**
+
+```xml
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<FlowCallout async="false" continueOnError="false" enabled="true" name="FC-PayloadToQueryString">
+    <DisplayName>FC-PayloadToQueryString</DisplayName>
+    <FaultRules/>
+    <Properties/>
+    <Parameters>
+        <Parameter name="SF-PayloadToQueryStrin.fields">["name"]</Parameter>
+    </Parameters>
+    <SharedFlowBundle>SF-PayloadToQueryString</SharedFlowBundle>
+</FlowCallout>
+```
+
+---
+
+## Call the proxy
+
+```sh
+curl --location --request POST {{proxyURL}} \
+--header 'Content-Type: application/json' \
+--data-raw '{
+    "name": "lama",
+    "gender": "female",
+    "age": 26
+}'
+```
+
+

sample-sharedflows/SF-PayloadToQueryString/sharedflowbundle/policies/JS-ExtractPayloadAndAssignQueryString.xml

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<Javascript async="false" continueOnError="false" enabled="true" timeLimit="200" name="JS-ExtractPayloadAndAssignQueryString">
+    <DisplayName>JS-ExtractPayloadAndAssignQueryString</DisplayName>
+    <Properties/>
+    <ResourceURL>jsc://JS-ExtractPayloadAndAssignQueryString.js</ResourceURL>
+</Javascript>

sample-sharedflows/SF-PayloadToQueryString/sharedflowbundle/resources/jsc/JS-ExtractPayloadAndAssignQueryString.js

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+if(request.content !== null || request.content !== ''){
+    try{
+        var fields = JSON.parse(context.getVariable("SF-PayloadToQueryStrin.fields"));
+        payload = JSON.parse(request.content);
+
+        for(var i in fields){
+            var field = fields[i];
+            if(payload[field] !== undefined){
+                print("[INFO] found key: " + field);
+                context.setVariable("request.queryparam."+field, payload[field]);
+                delete payload[field];
+            }
+            else{
+                print("[WARN] didn't find key: " + field);
+            }
+        }
+    }catch(e){
+        print("[ERROR] Exception Occured:\t" + e);
+    }
+    finally{
+        print("[INFO] Assigning the new payload to the request object");
+        context.setVariable("request.content", JSON.stringify(payload));
+    }
+}

sample-sharedflows/SF-PayloadToQueryString/sharedflowbundle/sharedflows/default.xml

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<SharedFlow name="default">
+    <Step>
+        <Name>JS-ExtractPayloadAndAssignQueryString</Name>
+    </Step>
+</SharedFlow>