View difference between Paste ID: gCCXiYJy and ujPwGMjm

 <form id="myform" action="http://ymlp.com/subscribe.php?id=<?= $userid; ?" type="POST">
 	<input type="hidden" id="userid" name="userid" value="<?= $userid; ?>">
 	<input type="checkbox" id="accept" name="accept" value="accept">
 	<input type="submit" name="submit" id="submit" value="submit">
 </form>
 <script
   src="https://code.jquery.com/jquery-3.3.1.min.js"
   integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8="
   crossorigin="anonymous"></script>
 <script>
 	$('#submit').on('click', function(e){
-		var userid = $('#userid').val();
+
-		$.ajax({
+		// check if checkbox is checked
-			type: "POST",
+		if ($('#accept').is('checked')) {
-			url: "myphp.php",
+			var userid = $('#userid').val();
-			data: {'userid' : userid},
+			$.ajax({
-			success: function(data) {
+				type: "POST",
-				if ($.trim(data) == 'success') {
+				url: "myphp.php",
-					$('#myform').submit();
+				data: {'userid' : userid},
 				success: function(data) {
-			}
+					if ($.trim(data) == 'success') {
-		});
+						$('#myform').submit();
 					}
 				}
 			});
 		}
 	});
 </script>