Azure Function PLAYFAB_DEV_SECRET_KEY simple question

Hi.

I am working on uploading leaderboard scores with Azure Functions in my Unity Game. For now I have succeeded (the Azure Function works perfectly), but I have one doubt.

This is the Azure Function:

namespace FuncionRankingPrueba1
{
    public static class RankingPrueba
    {
        [FunctionName("UpdateRanking2602V3")]
        public static async Task<dynamic> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {
            string name;
            string time;
            string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
            dynamic data = JsonConvert.DeserializeObject(requestBody);
            name = data?.FunctionArgument?.name;
            time = data?.FunctionArgument?.time;
            int timeint = int.Parse(time);


            var request = new UpdatePlayerStatisticsRequest
            {
                PlayFabId = data.CallerEntityProfile.Lineage.MasterPlayerAccountId,
                Statistics = new List<StatisticUpdate>
            {
                new StatisticUpdate
                {
                    StatisticName = name,
                    Value = timeint
                }
            }
            };
            var apiSettings = new PlayFabApiSettings
            {
                TitleId = data.TitleAuthenticationContext.Id,
                DeveloperSecretKey = Environment.GetEnvironmentVariable("PLAYFAB_DEV_SECRET_KEY", EnvironmentVariableTarget.Process),
            };
            var serverApi = new PlayFabServerInstanceAPI(apiSettings);
            return await serverApi.UpdatePlayerStatisticsAsync(request);
        }
    }
}

I have added an Application Settings in Azure that is the PLAYFAB_DEV_SECRET_KEY, with my SECRET KEY found in Title Settings, so when Environment.GetEnvironmentVariable is called, it founds my DEV_SECRET_KEY. Without this, it doesn't work.

My question is: when I publish my game on the Play Store, do the players use my PLAYFAB_DEV_SECRET_KEY to update their score or do I need to change something of my azure function code?

For example this line of code.

DeveloperSecretKey = Environment.GetEnvironmentVariable("PLAYFAB_DEV_SECRET_KEY", EnvironmentVariableTarget.Process)

Do I also need to change any setting on the Azure Portal?

I don't know if the set up that I have right now is good for testing everything but not when a lot of players upload their scores once the game is on the Play Store.

Thanks.