// Get an instance of the Guzzle client
$guzzleClient = (new Thepixeldeveloper\Mondo\GuzzleClientFactory(getenv('ACCESS_TOKEN')))->getClient();

// and create a Mondo client
$client = new Thepixeldeveloper\Mondo\Client($guzzleClient, SerializerBuilder::create()->build());

// Pass the client into the relevant Client class.
$ping = new Thepixeldeveloper\Mondo\Client\Ping($client);

// Response is of the type Thepixeldeveloper\Mondo\Response\Ping\WhoAmI
$response = $ping->whoAmI();

$accounts = new Thepixeldeveloper\Mondo\Client\Accounts($client);
$accounts->getAccounts();

$balance = new Thepixeldeveloper\Mondo\Client\Balance($client);
$balance->getBalanceForAccountId(123);

$transactions = new Thepixeldeveloper\Mondo\Client\Transactions($client);
$transactions->getTransactionsForAccountId(123);
$transactions->getTransaction(456);