Add approval by api Rest

Add approval by api Rest

Hi, I'm Sergi Sacristán
I'm tring to do and shellScript to generate a  Stage approval in ServiceDesk plus,
 but I don't find  away of do it 

I have founded  this example but don't work .


In service Desk plus I've put this in the trigger side:

cmd /c start /wait powershell.exe -WindowStyle Hidden -file D:\ManageEngine\ServiceDesk\integration\custom_scripts\script.ps1 "$ITEM"

My Script contain this code

$approver = " mail@domain.net"

  $data = "{'operation': [{'INPUT_DATA': [{'StageOne': ['$approver']}], 'OPERATIONNAME': 'ADD_APPROVAL_STAGE'}], 'message': 'Approvals created', 'result': 'success'}"

return $data 


Can someone say and example.
Where is the problem?

what is the correct call, method  and operation?
PD: I have the last version available


thank you very much
Regards



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