Upgrading From Version 1.2
===========================

With version 2.0.0 of this library came major changes to the ciphertext format,
algorithms used for encryption, and API.

In version 1.2, keys were represented by 16-byte string variables. In version
2.0.0, keys are represented by objects, instances of the `Key` class. This
change was made in order to make it harder to misuse the API. For example, in
version 1.2, you could pass in *any* 16-byte string, but in version 2.0.0 you
need a `Key` object, which you can only get if you're "doing the right thing."

This means that for all of your old version 1.2 keys, you'll have to:

1. Generate a new version 2.0.0 key.
2. For all of the ciphertexts encrypted under the old key:
    1. Decrypt the ciphertext using the old version 1.2 key.
    2. Re-encrypt it using the new version 2.0.0 key.

Use the special `Crypto::legacyDecrypt()` method to decrypt the old ciphertexts
using the old key and then re-encrypt them using `Crypto::encrypt()` with the
new key. Your code will look something like the following. To avoid data loss,
securely back up your keys and data before running your upgrade code.

```php
<?php

    // ...

    $legacy_ciphertext = // ... get the ciphertext you want to upgrade ...
    $legacy_key = // ... get the key to decrypt this ciphertext ...

    // Generate the new key that we'll re-encrypt the ciphertext with.
    $new_key = Key::createNewRandomKey();
    // ... save it somewhere ...

    // Decrypt it.
    try {
        $plaintext = Crypto::legacyDecrypt($legacy_ciphertext, $legacy_key);
    } catch (Defuse\Crypto\Exception\WrongKeyOrModifiedCiphertextException $ex)
    {
        // ... TODO: handle this case appropriately ...
    }

    // Re-encrypt it.
    $new_ciphertext = Crypto::encrypt($plaintext, $new_key);

    // ... replace the old $legacy_ciphertext with the new $new_ciphertext

    // ...
```

• [D] classes
• [F] CryptoDetails.md
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• [F] FAQ.md
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• [F] InstallingAndVerifying.md
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• [F] InternalDeveloperDocs.md
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• [F] Tutorial.md
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• [F] UpgradingFromV1.2.md
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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