Function maskCardNumber

static/js/payment.js:333–338

(cardNumber)

}

function maskCardNumber(cardNumber) {
    const digits = String(cardNumber || "").replace(/\D/g, "");
    if (!digits) return "-";
    if (digits.length <= 8) return `${digits.slice(0, 2)}****${digits.slice(-2)}`;
    return `${digits.slice(0, 4)}****${digits.slice(-4)}`;
}

function resolveCountryAlias(raw) {
    const key = String(raw || "").trim();