https://www.crockettdoodles.com/wp-content/plugins/woocommerce-ebizcharge-gateway/assets/js/check_cvv.js?ver=1

1/*! 
2jQuery CVV Validate v1.0 
3| (c) CBS Foundation and other contributors
4| CBS/license 
5*/
6function validate_cvv(str) {
7
8    if (jQuery("input#place_order").attr("disabled") !== "disabled") {
9        jQuery("input#place_order").attr("disabled", "disabled");
10        jQuery("input#place_order").val("Please enter 3 or 4 numbers in the card security code field");
11    }
12
13    for (var i = 0; i < str.length; i++) {
14        if (isNaN(parseInt(str.charAt(i), 10)) || i > 3) {
15            return;
16        }
17    }
18
19    if (i > 2) {
20        jQuery("input#place_order").removeAttr("disabled");
21        jQuery("input#place_order").val("Place order");
22    }
23
24}
25
26function cardTypeAllowed(selectedCard, cardTypes) {
27    return (cardTypes.indexOf(selectedCard) > -1);
28}
29
30function getCardType(value) {
31    var result = '';
32
33    if (/^5[12345]\d{14}$/.test(value)) {
34        result = "MasterCard";
35
36    } else if (/^4\d{12}(\d\d\d){0,1}$/.test(value)) {
37        result = "Visa";
38
39    } else if (/^6011\d{12}$/.test(value)) {
40        result = "Discover";
41
42    } else if (/^3[47]/.test(value)) {
43        result = "American Express";
44    }
45
46    if (result !== '') {
47        var allowedCardTypes = jQuery('#allowedCardTypes').val();
48        var cardAllowed = cardTypeAllowed(result, allowedCardTypes);
49
50        if (cardAllowed) {
51            jQuery('#cardtype').val(result);
52            jQuery('.cardtype-new-error').hide();
53            jQuery("#cardtype").css({"border": "", "border-radius": "", "padding": ""}).removeClass('sixpixel');
54        } else {
55            jQuery('#cardtype').val('');
56            jQuery('.cardtype-new-error').html("<p>" + result + " not allowed</p>");
57            jQuery('.cardtype-new-error').show();
58        }
59
60    } else {
61        jQuery('#cardtype').val('');
62    }
63}