question

@Luc Vu

[Edited]

Here is the sample code that depicts the basic flow, for your reference:

using System.Threading.Tasks;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using PlayFab.AdminModels;
namespace PlayFab.Samples
{
    public static class ResetPassword
    {
        [FunctionName("ResetPassword")]
        public static async Task<dynamic> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {
            log.LogInformation($"{nameof(ResetPassword)} C# HTTP trigger function processed a request.");
            
            
            FunctionExecutionContext<dynamic> context = JsonConvert.DeserializeObject<FunctionExecutionContext<dynamic>>(await req.ReadAsStringAsync());
            dynamic args = context.FunctionArgument;
            var newPassword = args["newPassword"]; // retrieve the new password sent by the client, specified in ExecuteFunction -> FunctionParameter -> newPassword

            //set up title id and secret key for admin api to use 
            var adminApiSettings = new PlayFab.PlayFabApiSettings()
            {
                TitleId = Environment.GetEnvironmentVariable("PlayFab.TitleId", EnvironmentVariableTarget.Process),
                DeveloperSecretKey = Environment.GetEnvironmentVariable("PlayFab.TitleSecret", EnvironmentVariableTarget.Process),
            };
            
            var adminAPI = new PlayFabAdminInstanceAPI(adminApiSettings);

            //get player's token stored in internal data
            var getUserInternalDataResponse = await adminAPI.GetUserInternalDataAsync(new AdminModels.GetUserDataRequest(){
                PlayFabId = context.CallerEntityProfile.Lineage.MasterPlayerAccountId,
                Keys = new List<string> () {"Token"}
            });

            var tokenId = getUserInternalDataResponse.Result.Data["Token"].Value;
            //reset the password
            return await adminAPI.ResetPasswordAsync(new AdminModels.ResetPasswordRequest() {
                Password = newPassword,
                Token = tokenId
            });
        }
    }
}