question

Can someone please help me understand this part of recipe referral Code with Unity and Playfab.

This is a segment from the cloud script. Can someone better comment it so I may understand?

        //Before proceeding, validate the provided referral code. Use a Try / Catch block if you want to do more before returning the error to the client.




        var GetUserReadOnlyDataRequest = {
            "PlayFabId": args.referralCode,
            "Keys": [ PLAYER_REFERRAL_KEY ]
        }; 
        var GetUserReadOnlyDataResult = server.GetUserReadOnlyData(GetUserReadOnlyDataRequest);
        var referralValues = [];




-----------------What is above segment doing? ---------------



        if(!GetUserReadOnlyDataResult.Data.hasOwnProperty(PLAYER_REFERRAL_KEY))
        {
            // This was a valid referral code, but this is the first redeemed code.


------------------What does the above comment mean?? --------------




            referralValues.push(currentPlayerId);
            ProcessReferrer(args.referralCode, referralValues);
        }
        else
        {
            // This was a valid referral code, now we need to extract the JSON array


--------------Why is this a json array ? What Data are we retrieving here? ----------



            referralValues = JSON.parse(GetUserReadOnlyDataResult.Data[PLAYER_REFERRAL_KEY].Value);
            if(Array.isArray(referralValues))
            {
                // need to ensure we have not exceded the MAXIMUM_REFERRALS
                 {
                    // here we know that the referrer has not exceeded the max, so we will add the current player 
                    referralValues.push(currentPlayerId);
                    ProcessReferrer(args.referralCode, referralValues);
                }
                else
                {
                    // Referrer has exceeded the MAXIMUM_REFERRALS
                    // this is not an error, but the referrer does not get thier reward.
                    log.info("Player:" + args.referralCode + " has hit the maximum number of referrals (" + MAXIMUM_REFERRALS + ")." );
                }
            }
            else
            {
                throw "An error occured when parsing the referrer's player data.";
            }
        }




----------The below code is obvious , but what baout the above code? ----------

        // finally, reward the calling player
        return GrantReferralBonus(args.referralCode);
    } catch(e) {
        var retObj = {};
        retObj["errorDetails"] = "Error: " + e;
        return retObj;
    }
};