Smart usage:
$pastebinApi = new PastebinApi('YOUR_DEV_KEY);
$url = $pastebinApi->createPaste('paste_code');
$url = $pastebinApi->getPasteList('USER_CODE');
$url = $pastebinApi->deletePaste('USER_CODE','API_PAST_CODE');
$url = $pastebinApi->getPastesRaw('USER_CODE','API_PAST_CODE');
Method сreatePaste has additional params, look at method type hinting for detail, and pastenbin