$filter = array( '/restapi/v1.0/account/~/extension', ); $paramArray = array( "eventFilters" => $filter, "deliveryMode" => array( "transportType" => "WebHook", "encryption" => "false", "address" => "https://abc.ngrok.io/test.php?auth_token=" . $obj->GetAccessToken(), ), ); Post Call return the following error. WebHook URL working { "errorCode" : "SUB-520", "message" : "Validation Token is not returned", "errors" : [ { "errorCode" : "SUB-520", "message" : "Validation Token is not returned" } ]
}