code: def check_webhook_secret(app_configs=None, **kwargs):
  	
  	from . import settings as djstripe_settings
  
  	messages = []
  
  	secret = djstripe_settings.WEBHOOK_SECRET
  	if secret and not secret.startswith("whsec_"):
  		messages.append(
  			checks.Warning(
  				"DJSTRIPE_WEBHOOK_SECRET does not look valid",
  				hint="It should start with whsec_...",
  				id="djstripe.W003",
  			)
  		)
  
  	return messages
docs: Check that DJSTRIPE_WEBHOOK_SECRET looks correct