feat: allow trial on default plan of billing account

When the org is created, if a default billing account of customer
is registered to billing provider and a default plan is configured with
trial days, subscription will start within trial days.
By default, after trial expires, it will continue the subscription
if payment method is setup. If no payment is setup, it will auto cancel.
To cancel the plan after trial even after payment method is setup
in a customer account, set `billing.customer.default_plan_cancel_after_trial`
as true.

Signed-off-by: Kush Sharma <[email protected]>

billing/checkout/service.go

@@ -956,6 +956,14 @@ func (s *Service) Apply(ctx context.Context, ch Checkout) (*subscription.Subscri
 		if err != nil {
 			return nil, nil, fmt.Errorf("failed to create subscription: %w", err)
 		}
+
+		// if set to cancel after trial, schedule a phase to cancel the subscription
+		if ch.CancelAfterTrial && stripeSubscription.TrialEnd > 0 {
+			_, err := s.subscriptionService.Cancel(ctx, subs.ID, false)
+			if err != nil {
+				return nil, nil, fmt.Errorf("failed to schedule cancel of subscription after trial: %w", err)
+			}
+		}
 		return &subs, nil, nil
 	} else if ch.ProductID != "" {
 		chProduct, err := s.productService.GetByID(ctx, ch.ProductID)

billing/config.go

@@ -26,10 +26,11 @@ type RefreshInterval struct {
 }
 
 type AccountConfig struct {
-	AutoCreateWithOrg     bool   `yaml:"auto_create_with_org" mapstructure:"auto_create_with_org"`
-	DefaultPlan           string `yaml:"default_plan" mapstructure:"default_plan"`
-	DefaultOffline        bool   `yaml:"default_offline" mapstructure:"default_offline"`
-	OnboardCreditsWithOrg int64  `yaml:"onboard_credits_with_org" mapstructure:"onboard_credits_with_org"`
+	AutoCreateWithOrg           bool   `yaml:"auto_create_with_org" mapstructure:"auto_create_with_org"`
+	DefaultPlan                 string `yaml:"default_plan" mapstructure:"default_plan"`
+	DefaultOffline              bool   `yaml:"default_offline" mapstructure:"default_offline"`
+	OnboardCreditsWithOrg       int64  `yaml:"onboard_credits_with_org" mapstructure:"onboard_credits_with_org"`
+	DefaultPlanCancelAfterTrial bool   `yaml:"default_plan_cancel_after_trial" mapstructure:"default_plan_cancel_after_trial"`
 }
 
 type PlanChangeConfig struct {

core/event/service.go

@@ -135,17 +135,20 @@ func (p *Service) EnsureDefaultPlan(ctx context.Context, orgID string) error {
 				return fmt.Errorf("failed to get default plan: %w", err)
 			}
 
+			var totalPrice int64
 			for _, prod := range defaultPlan.Products {
 				for _, price := range prod.Prices {
-					if price.Amount > 0 {
-						return fmt.Errorf("default plan is not free")
-					}
+					totalPrice += price.Amount
 				}
 			}
+			if totalPrice > 0 && defaultPlan.TrialDays == 0 {
+				return fmt.Errorf("default plan is not free to start")
+			}
+
 			_, _, err = p.checkoutService.Apply(ctx, checkout.Checkout{
-				CustomerID: customr.ID,
-				PlanID:     defaultPlan.ID,
-				SkipTrial:  true,
+				CustomerID:       customr.ID,
+				PlanID:           defaultPlan.ID,
+				CancelAfterTrial: p.billingConf.AccountConfig.DefaultPlanCancelAfterTrial,
 			})
 			if err != nil {
 				return fmt.Errorf("failed to apply default plan: %w", err)