$client = new WeFact(); $client->setApiToken($yourApiToken);

$invoices = $client->invoices->list();

$invoice = $client->invoices->show([ 'InvoiceCode' => 'F0001', ]);

$invoice = $client->invoices->create([ 'DebtorCode' => 'DB10000', 'InvoiceLines' => [ [ 'Number' => 2, 'ProductCode' => 'P0001' ], [ 'Description' => 'Reiskosten à € 0,19 per km', 'PriceExcl' => 0.19 ] ] ]);

$invoice = $client->invoices->edit([ 'Identifier' => 1, 'Discount' => 10, 'Term' => 30, ]);

$invoice = $client->invoices->delete([ 'Identifier' => 1, ]);

$invoices = $client->attachments->download([ 'ReferenceIdentifier' => '1', 'Type' => 'pricequote', 'Filename' => 'sample.pdf', ]);