AuthController.php

<?php
 public function postSignin(Request $request)
    {
        $data = [
            "username" => $request->input('email'),
            "password" => $request->input('password')
          ];
        $respon=GatewayService::login($data);

      if ($respon->status == true)
      {
            return redirect('/');
      }
      else
      {
           return redirect()->back()->with('error', $respon->message);
      }

    }

?>