Add subcription feature 4

frontend/src/api/types/auth.ts

@@ -31,6 +31,9 @@ export interface UserRegistration {
   billing_cycle?: 'monthly' | 'yearly' | null;  // Default: "monthly" - Billing cycle preference
   payment_method_id?: string | null;  // Stripe payment method ID
   coupon_code?: string | null;  // Promotional coupon code for discounts/trial extensions
+  // Payment setup data (passed to complete-registration after 3DS)
+  customer_id?: string | null;  // Stripe customer ID from payment setup
+  trial_period_days?: number | null;  // Trial period from coupon
   // GDPR Consent fields
   terms_accepted?: boolean;  // Default: true - Accept terms of service
   privacy_accepted?: boolean;  // Default: true - Accept privacy policy
@@ -68,6 +71,7 @@ export interface RegistrationStartResponse {
   plan_id?: string | null;  // Plan ID
   payment_method_id?: string | null;  // Payment method ID
   billing_cycle?: string | null;  // Billing cycle
+  trial_period_days?: number | null;  // Trial period from coupon (e.g., 90 for PILOT2025)
   email?: string | null;  // User email
   state_id?: string | null;  // Registration state ID for tracking
   message?: string | null;  // Message explaining what needs to be done