def METHOD_NAME(client, response):
    """Retrieve related payments for a customer."""
    response.get(f"https://api.mollie.com/v2/customers/{CUSTOMER_ID}", "customer_single")
    response.get(f"https://api.mollie.com/v2/customers/{CUSTOMER_ID}/payments", "customer_payments_multiple")
    customer = client.customers.get(CUSTOMER_ID)
    payments = customer.payments.list()
    assert_list_object(payments, Payment)