public static function getJson()
{
return '{"email":"TestSample","recipient_first_name":"TestSample","recipient_last_name":"TestSample","recipient_business_name":"TestSample","number":"TestSample","status":"TestSample","lower_total_amount":' . CurrencyTest::getJson() . ',"upper_total_amount":' . CurrencyTest::getJson() . ',"start_invoice_date":"TestSample","end_invoice_date":"TestSample","start_due_date":"TestSample","end_due_date":"TestSample","start_payment_date":"TestSample","end_payment_date":"TestSample","start_creation_date":"TestSample","end_creation_date":"TestSample","page":"12.34","page_size":"12.34","total_count_required":true,"archived":true}';
}