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
  Delete
• [F] FAQ.md
  Delete
• [F] InstallingAndVerifying.md
  Delete
• [F] InternalDeveloperDocs.md
  Delete
• [F] Tutorial.md
  Delete
• [F] UpgradingFromV1.2.md
  Delete

Service Section

Our Services: Streamlining Your Payment Experience with Excellence

Discover how our services are designed to enhance your NFC Pay experience with convenience, security, and innovative solutions. From managing transactions to secure payments, we are dedicated to providing seamless support every step of the way.

Secure Card Storage

Easily save your credit and debit card details within our app for quick and secure transactions. This feature ensures that your payment information is protected with advanced encryption and can be used for future purchases with just a tap.

Effortless Money Transfers

Transfer funds quickly and securely between users with our streamlined money transfer service. Simply select the recipient, enter the amount, and authorize the transaction for instant, hassle-free transfers.

Merchant Account Setup

Activate your merchant account effortlessly to start receiving payments. Our intuitive setup process ensures that you can begin accepting transactions smoothly, helping your business thrive with minimal setup time.

Real-Time Transaction Tracking

Keep track of all your transactions in real time through our app. Monitor payment statuses, view transaction history, and manage your account efficiently, ensuring complete control over your financial activities.

Customer Support

Our dedicated support team is available to assist you with any queries or issues. Whether you need help with setting up your account or resolving transaction-related questions, we’re here to provide prompt and reliable assistance.