Code

<!DOCTYPE html>
<html lang="en">
<head>
        <meta charset="UTF-8">
        <title>Open-Source Card Credit Checker</title>
        <link rel="stylesheet" href="style/style.css">
        <link href="https://fonts.googleapis.com/css?family=Open+Sans" rel="stylesheet">
        <script src="https://use.fontawesome.com/6ed0465ccd.js"></script>
        <script src="https://code.jquery.com/jquery-3.2.1.js"
  integrity="sha256-DZAnKJ/6XZ9si04Hgrsxu/8s717jcIzLy3oi35EouyE="
  crossorigin="anonymous"></script>
        <script>
                $(document).ready(function() {
                        $("#cc-clear").click(function(e) {

                                e.preventDefault();
                                $("#cc-list").empty();
                        });
                });
        </script>
</head>
<body>!
        <-- Start Content -->
        <div class="content">

                <h1>CC Checker</h1>
                <form action="check.php" method="post">
                        <div class="textarea">
                                <textarea name="cc-list" id="cc-list">Paste CC list here in
this format: NUMBER|MONTH|YEAR|CVV</textarea>
                        </div>
                        <div class="button">
                                <button id="cc-clear">Clear list</button>
                                <input type="submit" id="cc-check" value="Start check">

                        </div>

                        <span title="Github"><a href="https://github.com/viniciusbrokeh"><p
class="credits"><i class="fa fa-github-alt"></i> /viniciusbrokeh</p></a></span>

                        <span title="Twitter"><a href="https://twitter.com/Br0keh"><p
class="credits"><i class="fa fa-twitter"></i> /Br0keh</p></a></span>
                </form>


        </div>
        <!-- End Content -->
</body>


check:

<!DOCTYPE html>
<html lang="en">
<head>
        <meta charset="UTF-8">
        <title>Open-Source Card Credit Checker</title>
        <link rel="stylesheet" href="style/style.css">
        <link href="https://fonts.googleapis.com/css?family=Open+Sans" rel="stylesheet">
        <script src="https://use.fontawesome.com/6ed0465ccd.js"></script>
        <script src="https://code.jquery.com/jquery-3.2.1.js"
  integrity="sha256-DZAnKJ/6XZ9si04Hgrsxu/8s717jcIzLy3oi35EouyE="
  crossorigin="anonymous"></script>
        <script>
                $(document).ready(function() {
                        $("#cc-clear").click(function(e) {

                                e.preventDefault();
                                $("#cc-list").empty();
                        });
                });
        </script>
</head>
<body>
        <!-- Start Content -->
        <div class="content">

                <h1>Results</h1>
                <br>
                <table style="width: 100%">
                        <tr>
                                <th>Result</th>
                                <th>Card number</th>
                                <th>Month</th>
                                <th>Year</th>
                                <th>CVV</th>
                        </tr>


                </table>


                                <!-- CREDITS -->
                        <br><br>
                        <center>
                        <span title="Github"><a href="https://github.com/viniciusbrokeh"><p
class="credits"><i class="fa fa-github-alt"></i> /viniciusbrokeh</p></a></span>

                        <span title="Twitter"><a href="https://twitter.com/Br0keh"><p
class="credits"><i class="fa fa-twitter"></i> /Br0keh</p></a></span>
                        </center>


        </div>
        <!-- End Content -->
</body>


gateway:

<!DOCTYPE html>
<html lang="en">
<head>
        <meta charset="UTF-8">
        <title>Fake Payment Gateway</title>
</head>
<body>
        <center>
        <h1>Fake Gateway</h1>

                <form action="" method="post">
                <p>Card number</p>
                <input type="text" required name="cardnumber">
                <p>Mouth</p>
                <input type="text" required name="mouth">
                <p>Year</p>
                <input type="text" required name="year">
                <p>CVV</p>
                <input type="text" required name="cvv">
                <br><br>
                <input type="submit" name="buy" value="Buy">
        </form>

        </center>

</body>