TwitchResetUserRewardCounter

Reset user reward counters for the specified reward id and user Id

public void TwitchResetUserRewardCounter(string rewardId, string userId)
rewardId
string required

Id of your reward. Available by right-clicking your reward under Platforms > Twitch > Channel Point Rewards

userId
string required 
void

using System;
public class CPHInline
{
    public bool Execute()
    {
        //Define reward id you want to reset user counter of
        string rewardId = "4fcc2d13-9bcf-4c18-9d91-821a15f4b6e5";
        //Get user id of current user id
        CPH.TryGetArg("userId",out string userId);

        CPH.TwitchResetUserRewardCounter(rewardId, userId);         return true;
    }
}