code: private UserInfoIssueResponse callUserInfoIssue(String accessToken, Map<String, Object> claims)
      {
          // Create a request for /api/auth/userinfo/issue API.
          UserInfoIssueRequest request = new UserInfoIssueRequest()
              .setToken(accessToken);
  
          if (claims != null && claims.size() != 0)
          {
              request.setClaims(claims);
          }
  
          try
          {
              // Call Authlete's /api/auth/userinfo/issue API.
              return mApi.userinfoIssue(request);
          }
          catch (AuthleteApiException e)
          {
              // The API call failed.
              throw apiFailure("/api/auth/userinfo/issue", e);
          }
      }
docs: Call Authlete's {@code /api/auth/userinfo/issue} API.