config( 123456, // Merchant ID 'sharedSecret', // Shared Secret KlarnaCountry::SE, // Country KlarnaLanguage::SV, // Language KlarnaCurrency::SEK, // Currency Klarna::BETA, // Server 'json', // PClass Storage '/srv/pclasses.json', // PClass Storage URI path true, // SSL true // Remote logging of response times of xmlrpc calls ); // OR you can set the config to loads from a file, for example /srv/klarna.json: // $k->setConfig(new KlarnaConfig('/srv/klarna.json')); /** * 2. Completely refund a invoice. */ // Here you enter the invoice number: $invNo = '123456'; try { $result = $k->creditInvoice( $invNo, // Invoice Number '' // Credit number. (Optional). ); echo "Result: {$result}\n"; /* Invoice fully refunded, proceed accordingly. $result contains the invoice number of the refunded invoice. */ } catch(Exception $e) { // Something went wrong, print the message: echo "{$e->getMessage()} (#{$e->getCode()})\n"; }