CheckoutVerifier

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CheckoutVerifier

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Verify your In-App Purchase receipts & protect your Apps from hacking, patching used by Piracy Apps like Lucky Patcher.

CheckoutVerifier 최신버젼 다운로드

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# CheckoutVerifier

[![Codacy Badge](https://app.codacy.com/project/badge/Grade/bb126216417b45668b81e08090d2d081)](https://www.codacy.com/gh/ItzNotABug/CheckoutVerifier/dashboard?utm_source=github.com&amp;utm_medium=referral&amp;utm_content=ItzNotABug/CheckoutVerifier&amp;utm_campaign=Badge_Grade)

CheckoutVerifier helps you Verify your In-App Purchase receipts & protect your Apps from hacking, patching used by Piracy Apps like Lucky Patcher.
 Since I was using these classes in every project, the copy / pasting of classes was annoying so thought of releasing it as a library which might be of help to others too!

## How does it work?
Well, the library sends the Signed Json Response & Signature that you receive after a purchase is completed on a specified server url where it checks the signature of that response data with your BASE64 Key provided to you in your Developer Console.

## Set Up
#### * Get Licensing API Key
Navigate to Developer Console & Select your App.
 Go to Development Tools > Services & API.
 Copy the BASE64 Licensing Key

#### * Creating a Verifying PHP File
Just a create a File & name it as `verify.php` or anything you want.
 Paste the following code in it & Upload it to your server.

```php
<?php
 $data = $_GET['jsonResponse'];
 $signature = $_GET['signature'];
 $key_64 = "YOUR BASE64 KEY THAT YOU GOT FROM DEVELOPER CONSOLE, THERE SHOULD BE NO SPACES!";

$key =  "-----BEGIN PUBLIC KEY-----\n".
            chunk_split($key_64, 64,"\n").
            "-----END PUBLIC KEY-----";

$key = openssl_get_publickey($key);

$ok = openssl_verify($data, base64_decode($signature), $key, OPENSSL_ALGO_SHA1);
    if ($ok == 1) {
        echo "verified";
    } elseif ($ok == 0) {
        echo "unverified";
    } else {
        die ("fault, error checking signature");
    }

openssl_free_key($key);
?>
```

#### * Implementing Library (Gradle)
Note: Add `mavenCentral()` in `repositories` block.

```gradle
dependencies {
    // CheckoutVerifier now internally uses Kotlin Coroutines.
    implementation 'com.lazygeniouz:checkout-verifier:$library_version'
}
```

#### * CheckoutVerifier
Just pass on the required `PurchaseBundle` in the Constructor & call `authenticate();`
 The `authenticate()` returns a `Result` object.
 
 If the connection to the server was successful & a result was returned, 
 `CompletionResult(isVerified: Boolean)` is returned, 
 `ErrorResult(exception: Exception)` otherwise.

Example:
```kotlin
yourScope.launch {
 val purchaseBundle = PurchaseBundle(url, jsonResponse, signature)
 when (val result = CheckoutVerifier(purchaseBundle).authenticate()) {
 is CompletionResult -> {
 val verified = result.isVerified
 // Do something
 }
 is ErrorResult -> Log.d(TAG, result.exception.message)
 }
}
```

CheckoutVerifier

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