<?php

namespace Faker\Calculator;

class Iban
{
    /**
     * Generates IBAN Checksum
     *
     * @return string Checksum (numeric string)
     */
    public static function checksum(string $iban)
    {
        // Move first four digits to end and set checksum to '00'
        $checkString = substr($iban, 4) . substr($iban, 0, 2) . '00';

        // Replace all letters with their number equivalents
        $checkString = preg_replace_callback(
            '/[A-Z]/',
            static function (array $matches): string {
                return (string) self::alphaToNumber($matches[0]);
            },
            $checkString,
        );

        // Perform mod 97 and subtract from 98
        $checksum = 98 - self::mod97($checkString);

        return str_pad($checksum, 2, '0', STR_PAD_LEFT);
    }

    /**
     * Converts letter to number
     *
     * @return int
     */
    public static function alphaToNumber(string $char)
    {
        return ord($char) - 55;
    }

    /**
     * Calculates mod97 on a numeric string
     *
     * @param string $number Numeric string
     *
     * @return int
     */
    public static function mod97(string $number)
    {
        $checksum = (int) $number[0];

        for ($i = 1, $size = strlen($number); $i < $size; ++$i) {
            $checksum = (10 * $checksum + (int) $number[$i]) % 97;
        }

        return $checksum;
    }

    /**
     * Checks whether an IBAN has a valid checksum
     *
     * @return bool
     */
    public static function isValid(string $iban)
    {
        return self::checksum($iban) === substr($iban, 2, 2);
    }
}

• [F] Ean.php
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• [F] Iban.php
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• [F] Inn.php
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• [F] Isbn.php
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• [F] Luhn.php
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• [F] TCNo.php
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About Section

About NFC Pay: Our Story and Mission

NFC Pay was founded with a vision to transform the way people handle transactions. Our journey is defined by a commitment to innovation, security, and convenience. We strive to deliver seamless, user-friendly payment solutions that make everyday transactions effortless and secure. Our mission is to empower you to pay with ease and confidence, anytime, anywhere.

• Simplifying Payments, One Tap at a Time.
• Reinventing Your Wallet for Modern Convenience.
• Smart Payments for a Effortless Lifestyle.
• Experience the Ease of Tap and Pay.
• Innovative Solutions for Your Daily Transactions.

FAQ Section

Frequently Asked Questions About NFC Pay

Here are answers to some common questions about NFC Pay. We aim to provide clear and concise information to help you understand how our platform works and how it can benefit you. If you have any further inquiries, please don’t hesitate to contact our support team.

How do I register for NFC Pay?

Download the app and sign up using your email or phone number, then complete the verification process.

Is my payment information secure?

Yes, we use advanced encryption and security protocols to protect your payment details.

Can I add multiple cards to my NFC Pay wallet?

Absolutely, you can link multiple debit or credit cards to your wallet.

How do I transfer money to another user?

Go to the transfer section, select the recipient, enter the amount, and authorize the transfer.

What should I do if I forget my PIN?

Use the “Forgot PIN” feature in the app to reset it following the provided instructions.

How can I activate my merchant account?

Sign up for a merchant account through the app and follow the setup instructions to start accepting payments.

Can I track my payment status?

Yes, you can view and track your payment status in the account dashboard