FSM||On press Recall calculate time travel

I’m working on an IFS FSM application where I’m adding functionality.

Task: search for Open task → click the Recall button → show a table popup that shows the technician’s travel time from current location and from home location to the task location (based on latitude/longitude).

I created a .NET function that calls the Bing API to calculate these travel times. However, when I try to call the .NET function from the client script, I get errors.

Attempts:

1. var calcResult = getDBValues('C_CALCULATE_RECALL_DISTANCES', [currTaskId]);
   Output: No change is reflected.

2. JavaScript

   var calculator = new WOMIntegrationPolicies.BusinessPolicies.RecallNAManagerComponent.RecallNAManagerCustBusPolicyMgr();

   var calcResult = calculator.CalculateRoadDistancesForRecall(currTaskId.toString());

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   Error: Unimplemented constructor called: WOMIntegrationPolicies.BusinessPolicies.RecallNAManagerComponent.RecallNAManagerCustBusPolicyMgr

3. JavaScript

   if (currTaskId && currTaskId != '') {

   var xmlPerform = new XMLPerform("perform_travel_time");

   xmlPerform.AddParameter("taskId", currTaskId);

   xmlPerform.Post();

   }

   Error: Unimplemented constructor called: XMLPerform

also Created Perform definition.

Please suggest a different way to call the Bing API or to invoke the already-defined .NET function from client script.