def check_stripe_api_host(app_configs=None, **kwargs):
    """
    Check that STRIPE_API_HOST is not being used in production.
    """
    from django.conf import settings

    messages = []

    if not settings.DEBUG and hasattr(settings, "STRIPE_API_HOST"):
        messages.append(
            checks.Warning(
                (
                    "STRIPE_API_HOST should not be set in production! "
                    "This is most likely unintended."
                ),
                hint="Remove STRIPE_API_HOST from your Django settings.",
                id="djstripe.W002",
            )
        )

    return messages

    Check that STRIPE_API_HOST is not being used in production.
    
djstripe/checks.py