start.php

<?php

require_once '../../vendor/autoload.php';
require_once '../config.php';

try {
    # Required
    $startData['amount'] = 12.50;
    $startData['returnUrl'] = dirname(\Paynl\Helper::getBaseUrl()) . '/return.php';

    # Optional
    $startData = array_merge($startData, array(
      'exchangeUrl' => dirname(\Paynl\Helper::getBaseUrl()) . '/exchange.php',
      'paymentMethod' => 10,
      'currency' => 'EUR',
      'expireDate' => new \DateTime('2016-04-01'),
      'orderNumber' => '123456', # Max 16 alphanumeric characters
      'description' => 'Order 123456',
      'testmode' => 0,
      'extra1' => 'ext1',
      'extra2' => 'ext2',
      'extra3' => 'ext3',
      'transferData' => array(
        'transferData1' => 'transferData1',
        'transferData2' => 'transferData2',
        'gaClientId' => '123456789.1234567890'
      ),
      'ipaddress' => '10.0.0.1',
      'invoiceDate' => new \DateTime('now'),
      'deliveryDate' => new \DateTime('2016-06-06'), # In case of tickets for an event, use the event date here
      'products' => array(
        array(
          'id' => 1,
          'name' => 'my product',
          'price' => 5,
          'vatPercentage' => 21,
          'qty' => 1,
          'type' => \Paynl\Transaction::PRODUCT_TYPE_ARTICLE
        ),
        array(
          'id' => 2,
          'name' => 'other product 9 %',
          'price' => 5,
          'vatPercentage' => 9,
          'qty' => 1,
          'type' => \Paynl\Transaction::PRODUCT_TYPE_ARTICLE
        ),
        array(
          'id' => 'shipping',
          'name' => 'Next day delivery',
          'price' => 5,
          'vatPercentage' => 21,
          'qty' => 1,
          'type' => \Paynl\Transaction::PRODUCT_TYPE_SHIPPING
        ),
        array(
          'id' => 'fee',
          'name' => 'Giftwrapping',
          'price' => 1,
          'vatPercentage' => 21,
          'qty' => 1,
          'type' => \Paynl\Transaction::PRODUCT_TYPE_HANDLING
        ),
        array(
          'id' => '5543',
          'name' => 'Coupon 3,50 discount',
          'price' => -3.5,
          'vatPercentage' => 21,
          'qty' => 1,
          'type' => \Paynl\Transaction::PRODUCT_TYPE_DISCOUNT
        ),
      ),
      'language' => 'EN',
      'enduser' => array(
        'initials' => 'T',
        'lastName' => 'Test',
        'gender' => 'M',
        'birthDate' => new \DateTime('1999-02-15'),
        'phoneNumber' => '0612345678',
        'emailAddress' => 'testbetaling@pay.nl',
        'customerReference' => '456789',
        'customerTrust' => 0,
      ),
      'address' => array(
        'streetName' => 'Test',
        'houseNumber' => '10',
        'houseNumberExtension' => 'A',
        'zipCode' => '1234AB',
        'city' => 'Test',
        'country' => 'NL',
      ),
      'company' => array(
        'name' => 'CompanyName',
        'cocNumber' => '12345678',
        'vatNumber' => 'NL0123456789',
        'countryCode' => 'NL'
      ),
      'invoiceAddress' => array(
        'initials' => 'IT',
        'lastName' => 'ITEST',
        'streetName' => 'Istreet',
        'houseNumber' => '70',
        'houseNumberExtension' => 'A',
        'zipCode' => '5678CD',
        'city' => 'ITest',
        'country' => 'CA',
        'regionCode' => 'CA-NL',
      ),
      'object' => 'PHPSDK'
    ));

    # Start the transaction
    $result = \Paynl\Transaction::start($startData);

    # Save this transactionid and link it to your order
    $transactionId = $result->getTransactionId();

    echo '<a href="' . $result->getRedirectUrl() . '">' . $result->getRedirectUrl() . '</a><br>';
    echo $transactionId;

} catch (\Paynl\Error\Error $e) {
    echo "Fout: " . $e->getMessage();
}