use Omnipay\Omnipay;
$gateway = Omnipay::create('IngenicoePayments');
$gateway->setMode('test');
$gateway->setPSPID('PSID');
$gateway->setLanguage('nl_NL');
$gateway->setShaIn('SHAIN');
$gateway->setShaOut('SHAOUT');
$gateway->setHashing('SHA-1');
$request = $gateway->purchase([
	'amount' => 9999, 
	'currency' => 'EUR', 
	'returnUrl' => 'https://example.com/tmp/done',
	'cancelUrl' => 'https://example.com/tmp/cancel', 
	'transactionId' => '1111111', 
	'description' => 'DESCRIPTION',
	'paymentMethod' => 'PAYMENTMETHOD',
	'card'	=> [
		'firstName'			=> 'firstName',
		'lastName'			=> 'lastName',
		'billingAddress1'	=> 'billingAddress1',
		'postcode'			=> 'postcode',
		'city'				=> 'city',
		'phone'				=> 'phone',
		'email'				=> 'email'
	],
	'customfields' => [
		'XX' => 'XX',
	]
]);
$response = $request->send();
$response->redirect();

use Omnipay\Omnipay;
$gateway = Omnipay::create('IngenicoePayments');
$gateway->setMode('test');
$gateway->setPSPID('PSID');
$gateway->setLanguage('nl_NL');
$gateway->setShaIn('SHAIN');
$gateway->setShaOut('SHAOUT');
$request = $gateway->completePurchase(['transaction' => $_GET]);
$response = $request->send();
if ($response->isSuccessful()) {
	echo $response->getTransactionId();
}else{
	echo $response->getError();
}