def METHOD_NAME(token_client, organizer, customer):
    with scopes_disabled():
        customer.provider = organizer.sso_providers.create(
            method="oidc",
            name="OIDC OP",
            configuration={}
        )
        customer.external_identifier = "123"
        customer.save()
    resp = token_client.patch(
        '/api/v1/organizers/{}/customers/{}/'.format(organizer.slug, customer.identifier),
        format='json',
        data={
            'external_identifier': '234',
        }
    )
    assert resp.status_code == 200
    customer.refresh_from_db()
    assert customer.external_identifier == "123"