Function normalizeYear

static/js/payment.js:363–368

(value)

}

function normalizeYear(value) {
    const digits = String(value || "").replace(/\D/g, "");
    if (!digits) return "";
    if (digits.length === 2) return `20${digits}`;
    return digits.slice(0, 4);
}

function formatExpiryInput(month, year) {
    const mm = normalizeMonth(month);