public JsonResult GrantTokenByAdmin(int userid)
 {
     try
     {
         var token = _tokensService.GrantTokenByAdmin(userid);
         return(Json(new {
             Success = true,
             Token = token
         }));
     }
     catch (Exception ex)
     {
         return(Json(new
         {
             Success = true,
             Error = ex.Message
         }));
     }
 }