def METHOD_NAME(oauth_client, response):
    """Retrieve a single settlement method by ID."""
    response.get(f"https://api.mollie.com/v2/settlements/{SETTLEMENT_ID}", "settlement_single")
    settlement = oauth_client.settlements.get(SETTLEMENT_ID)
    assert isinstance(settlement, Settlement)
    assert isinstance(settlement.periods, dict)
    assert settlement.reference == "1234567.1804.03"
    assert settlement.created_at == "2018-04-06T06:00:01.0Z"
    assert settlement.settled_at == "2018-04-06T09:41:44.0Z"
    assert settlement.amount == {"currency": "EUR", "value": "39.75"}
    assert settlement.status == settlement.STATUS_OPEN
    assert settlement.is_open() is True
    assert settlement.is_canceled() is False
    assert settlement.is_failed() is False
    assert settlement.is_pending() is False
    assert isinstance(settlement.chargebacks, SettlementChargebacks)
    assert isinstance(settlement.payments, SettlementPayments)
    assert isinstance(settlement.refunds, SettlementRefunds)
    assert isinstance(settlement.captures, SettlementCaptures)