1. Generate recaptcha key

1. Goto https://www.google.com/u/2/recaptcha/admin/create

2. login with email id

3. enter domain name

4. get key and secret

2. Save key and secret in laravel .env

                    RECAPTCHA_KEY=
                    RECAPTCHA_SECRET=
                    

3. create the general.php file in config folder

                    return [
                        'RECAPTCHA_KEY' => env('RECAPTCHA_KEY', ''),
                        'RECAPTCHA_SECRET' => env('RECAPTCHA_SECRET', ''),
                    ];
                    

3. add a hidden field between the form tag for recaptcha token

                      <form id="verifyform">
                        <input type="hidden" name="recaptcha_response" id="recaptchaResponse">
                      </form>
                    

4. add recaptcha script at the bottom of the page

                    <script src="https://www.google.com/recaptcha/api.js?render={{config('general.RECAPTCHA_KEY')}}"></script>
                    

5. call recaptcha function before submiting the form for token

                    grecaptcha.execute('{{config('general.RECAPTCHA_KEY')}}', { action: 'contact' }).then(function (token) {
                     
                      $('#recaptchaResponse').val(token);
                      

                      $("#verifyform").submit();

                    });
                  

1. grecaptcha.execute() call recapcha api and return a token
2. token set into hiden field recaptchaResponse
3. use form submit() inside the grecaptcha.execute(); (submit() call after the response from recaptcha())

6. verify the recapta token in the controller

in the controller

                  public function verify(Request $r)
                    {
                           try{
                                  //set recaptcha api
                                  $recaptcha_url = 'https://www.google.com/recaptcha/api/siteverify';
                                  $recaptcha_secret = config('general.RECAPTCHA_KEY');

                                  //recaptcha token from the form (hidden field)
                                  $recaptcha_response = $input['recaptcha_response'];
                                  
                                  //verify recaptcha token using api 
                                  $recaptcha = file_get_contents($recaptcha_url . '?secret=' . $recaptcha_secret . '&response=' . $recaptcha_response);
                                  $recaptcha = json_decode($recaptcha);

                                  //if token is correct, api return success=true
                                  if ($recaptcha->success == true) {
                                      $isVerified = true;
                                  } else {
                                      $isVerified = false;
                                      return redirect()->back();
                                  }
                              }
                              catch(\Exception $e)
                              {            
                                  return redirect()->back();
                              }

                              if($isVerified==true){
                                 // write your code here
                                 BasicBooking::create($input);
                              }

                              //redirect to a route you want
                              return redirect()->route('booking.preview');

                    }