fix: add trial period for new subscriptions (#632)

backend/apps/account_payment/graphql.py

@@ -192,19 +192,23 @@ class Arguments:
  def mutate(cls, root, info, price_id):
  try:
  admin = info.context.user
+ internal_subscriptions = admin.internal_subscription.all()
 
  for s in [
  *admin.subscription_set.all(),
- *admin.internal_subscription.all(),
+ *internal_subscriptions,
  ]:
  if s.is_active:
  return cls(errors=["Conta possui inscrição ativa"])
 
  price = DJStripePrice.objects.get(djstripe_id=price_id)
+ trial_period_days = 0 if len(internal_subscriptions) > 0 else 7
+
  subscription: DJStripeSubscription = admin.customer.subscribe(
  price=price.id,
  payment_behavior="default_incomplete",
  payment_settings={"save_default_payment_method": "on_subscription"},
+ trial_period_days=trial_period_days,
  )
  Subscription.objects.create(admin=admin, subscription=subscription)
  return cls(subscription=subscription)