require_once 'lib/autoload.php';
\Fastbill\Connection\Wrapper::init('YOUR_EMAIL', 'YOUR_API_KEY');

$customer = new \Fastbill\Customer\Customer();
$customer['CUSTOMER_NUMBER']  = 1;
$customer['CUSTOMER_TYPE']    = 'business';
$customer['ORGANIZATION']     = 'Test Gbr';
$customer['SALUATION']        = 'mr';
$customer['FIRST_NAME']       = 'Max';
$customer['LAST_NAME']        = 'Mustemann';
$customer['ADDRESS']          = 'Musterstraße 1';
$customer['ZIPCODE']          = '80808';
$customer['CITY']             = 'München';
$customer['PAYMENT_TYPE']     = 1;
# the library changes the country code internally to the needed country id
$customer['COUNTRY_CODE']     = 'DE';
$customer->save();

$customer = \Fastbill\Customer\Finder::findOneById(123456);

$customer = \Fastbill\Customer\Finder::findOneById(123456);
$customer->delete();