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var data = {
  "OM.pf" : productCode, 
  "OM.pfu" : "1",
  "OM.pfr" : "1"productPrice
};
api.customEvent("Add To Favorites", data);

var data = {
  "OM.pf" : productCode, 
  "OM.pfu" : "-1",
  "OM.pfr" : "1"productPrice
};
api.customEvent("Add To Favorites", data);