$partner_name = "Test Partner";
$new_partner_id = $models->execute_kw($db, $uid, $password,
    'res.partner',
    'create', // Function name
    array( // Values-array
        array( // First record
            'name'=>$partner_name,
            'businessid'=>"1234567-1",
            'businessid_shown'=>True, // Show business id in the customer card
            'customer'=>True,
            'is_company'=>True,
            'street'=>"Street 123",
            'street2'=>"Floor 7",
            'city'=>"Tampere",
            'zip'=>"33101",
            'phone'=>"123456780",
            'email'=>"mail@example.com",
            'comment'=>"A free comment",
        )
    )
);