diff --git a/AGENTS.md b/AGENTS.md
index 6a2fdb1..b30317b 100755
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -10,38 +10,64 @@ This document provides technical details for AI agents working on the Aperonight
 
 #### 1. User Management (`app/models/user.rb`)
 - **Devise Integration**: Complete authentication system with registration, login, password reset
-- **Relationships**: Users can create events and purchase tickets
-- **Validations**: Email format, password strength, optional name fields
+- **Professional Users**: `is_professionnal` field for event promoters with enhanced permissions
+- **Onboarding System**: Multi-step onboarding process with `onboarding_completed` tracking
+- **Stripe Integration**: `stripe_customer_id` for accounting and invoice management
+- **Relationships**: Users can create events, purchase tickets, and manage promotion codes
+- **Validations**: Email format, password strength, optional name fields, company information
 
 #### 2. Event System (`app/models/event.rb`)
 - **States**: `draft`, `published`, `canceled`, `sold_out` with enum management
 - **Geographic Data**: Latitude/longitude for venue mapping
-- **Relationships**: Belongs to user, has many ticket types and tickets through ticket types
+- **Relationships**: Belongs to user, has many ticket types, tickets through ticket types, and orders
 - **Scopes**: Featured events, published events, upcoming events with proper ordering
+- **Duplication**: Event duplication functionality for similar events
 
-#### 3. Ticket Management
+#### 3. Order Management (`app/models/order.rb`)
+- **Order States**: `draft`, `pending_payment`, `paid`, `completed`, `cancelled`, `expired`
+- **Payment Processing**: Stripe integration with payment attempt tracking
+- **Platform Fees**: €0.50 fixed + 1.5% per ticket automatic calculation
+- **Expiration**: 15-minute draft order expiration with automatic cleanup
+- **Promotion Integration**: Support for discount code application
+- **Invoice Generation**: Automatic Stripe invoice creation for accounting
+
+#### 4. Promotion Code System (`app/models/promotion_code.rb`)
+- **Discount Management**: Fixed amount discounts (stored in cents, displayed in euros)
+- **Usage Controls**: Per-event and per-user association with usage limits
+- **Expiration**: Date-based expiration with active/inactive status management
+- **Validation**: Real-time validation during checkout process
+- **Tracking**: Complete usage tracking and analytics
+
+#### 5. Ticket Management
 - **TicketType** (`app/models/ticket_type.rb`): Defines ticket categories with pricing, quantity, sale periods
 - **Ticket** (`app/models/ticket.rb`): Individual tickets with unique QR codes, status tracking, price storage
+- **Order Association**: Tickets now belong to orders for better transaction management
 
-#### 4. Payment Processing (`app/controllers/events_controller.rb`)
+#### 6. Payment Processing (`app/controllers/orders_controller.rb`)
+- **Order-Based Workflow**: Complete shift from direct ticket purchase to order-based system
 - **Stripe Integration**: Complete checkout session creation and payment confirmation
-- **Session Management**: Proper handling of payment success/failure with ticket generation
+- **Session Management**: Proper handling of payment success/failure with order and ticket generation
 - **Security**: Authentication required, cart validation, availability checking
+- **Invoice Service**: Post-payment invoice generation with StripeInvoiceService
 
 ### Database Schema Key Points
 
 ```sql
--- Users table (managed by Devise)
+-- Users table (enhanced with professional features)
 CREATE TABLE users (
   id bigint PRIMARY KEY,
   email varchar(255) UNIQUE NOT NULL,
   encrypted_password varchar(255) NOT NULL,
   first_name varchar(255),
   last_name varchar(255),
+  is_professionnal boolean DEFAULT false,
+  onboarding_completed boolean DEFAULT false,
+  stripe_customer_id varchar(255),
+  company_name varchar(255),
   -- Devise fields: confirmation, reset tokens, etc.
 );
 
--- Events table
+-- Events table (enhanced with order management)
 CREATE TABLE events (
   id bigint PRIMARY KEY,
   user_id bigint REFERENCES users(id),
@@ -59,6 +85,40 @@ CREATE TABLE events (
   image varchar(500)
 );
 
+-- Order management system (new core table)
+CREATE TABLE orders (
+  id bigint PRIMARY KEY,
+  user_id bigint REFERENCES users(id),
+  event_id bigint REFERENCES events(id),
+  status varchar(255) DEFAULT 'draft',
+  total_amount_cents integer DEFAULT 0,
+  platform_fee_cents integer DEFAULT 0,
+  payment_attempts integer DEFAULT 0,
+  expires_at timestamp,
+  last_payment_attempt_at timestamp,
+  stripe_checkout_session_id varchar(255),
+  stripe_invoice_id varchar(255)
+);
+
+-- Promotion codes table (new discount system)
+CREATE TABLE promotion_codes (
+  id bigint PRIMARY KEY,
+  code varchar(255) UNIQUE NOT NULL,
+  discount_amount_cents integer DEFAULT 0,
+  expires_at datetime,
+  active boolean DEFAULT true,
+  usage_limit integer,
+  uses_count integer DEFAULT 0,
+  user_id bigint REFERENCES users(id),
+  event_id bigint REFERENCES events(id)
+);
+
+-- Order-promotion code join table
+CREATE TABLE order_promotion_codes (
+  order_id bigint REFERENCES orders(id),
+  promotion_code_id bigint REFERENCES promotion_codes(id)
+);
+
 -- Ticket types define pricing and availability
 CREATE TABLE ticket_types (
   id bigint PRIMARY KEY,
@@ -73,10 +133,11 @@ CREATE TABLE ticket_types (
   minimum_age integer
 );
 
--- Individual tickets with QR codes
+-- Individual tickets with QR codes (enhanced with order association)
 CREATE TABLE tickets (
   id bigint PRIMARY KEY,
   user_id bigint REFERENCES users(id),
+  order_id bigint REFERENCES orders(id),
   ticket_type_id bigint REFERENCES ticket_types(id),
   qr_code varchar(255) UNIQUE NOT NULL,
   price_cents integer NOT NULL,
@@ -107,38 +168,113 @@ CREATE TABLE tickets (
                            .limit(5)
 ```
 
-### 2. Stripe Payment Flow
+### 2. Order Management Flow (`app/controllers/orders_controller.rb`)
 
-#### Checkout Initiation (`events#checkout`)
-1. **Cart Validation**: Parse JSON cart data, validate ticket types and quantities
-2. **Availability Check**: Ensure sufficient tickets available before payment
-3. **Stripe Session**: Create checkout session with line items, success/cancel URLs
-4. **Metadata Storage**: Store order details in Stripe session metadata for later retrieval
+#### Order Creation and Payment
+1. **Cart-to-Order Conversion**: Convert shopping cart to draft order with 15-minute expiration
+2. **Platform Fee Calculation**: Automatic calculation of €0.50 fixed + 1.5% per ticket
+3. **Promotion Code Application**: Real-time discount validation and application
+4. **Stripe Checkout Session**: Create payment session with order metadata
+5. **Payment Retry**: Support for multiple payment attempts with proper tracking
 
 ```ruby
-# Key Stripe configuration
-session = Stripe::Checkout::Session.create({
-  payment_method_types: ['card'],
-  line_items: line_items,
-  mode: 'payment',
-  success_url: payment_success_url(event_id: @event.id, session_id: '{CHECKOUT_SESSION_ID}'),
-  cancel_url: event_url(@event.slug, @event),
-  customer_email: current_user.email,
-  metadata: {
-    event_id: @event.id,
-    user_id: current_user.id,
-    order_items: order_items.to_json
-  }
-})
+# Order creation with platform fees
+def create
+  @order = Order.new(order_params)
+  @order.user = current_user
+  @order.calculate_platform_fee
+  @order.set_expiration
+
+  if @order.save
+    session = create_stripe_checkout_session(@order)
+    redirect_to session.url, allow_other_host: true
+  else
+    render :new, status: :unprocessable_entity
+  end
+end
+
+# Platform fee calculation
+def calculate_platform_fee
+  ticket_count = order_items.sum(:quantity)
+  self.platform_fee_cents = 50 + (total_amount_cents * 0.015).to_i
+end
 ```
 
-#### Payment Confirmation (`events#payment_success`)
-1. **Session Retrieval**: Get Stripe session with payment status
-2. **Ticket Creation**: Generate tickets based on order items from metadata
-3. **QR Code Generation**: Automatic unique QR code creation via model callbacks
-4. **Success Page**: Display tickets with download links
+#### Payment Confirmation and Invoice Generation
+1. **Order Status Update**: Transition from pending_payment to paid
+2. **Ticket Generation**: Create tickets associated with the order
+3. **Stripe Invoice Creation**: Async invoice generation for accounting
+4. **Promotion Code Usage**: Increment usage counters for applied codes
 
-### 3. PDF Ticket Generation (`app/services/ticket_pdf_generator.rb`)
+### 3. Enhanced Stripe Integration
+
+#### StripeInvoiceService (`app/services/stripe_invoice_service.rb`)
+- Post-payment invoice creation with customer management
+- Line item processing with promotion discounts
+- PDF invoice URL generation for download
+- Accounting record synchronization
+
+```ruby
+class StripeInvoiceService
+  def initialize(order)
+    @order = order
+  end
+
+  def create_invoice
+    customer = find_or_create_stripe_customer
+    invoice_items = create_invoice_items(customer)
+
+    invoice = Stripe::Invoice.create({
+      customer: customer.id,
+      auto_advance: true,
+      collection_method: 'charge_automatically'
+    })
+
+    @order.update(stripe_invoice_id: invoice.id)
+    invoice.finalize_invoice
+  end
+end
+```
+
+### 4. Promotion Code System (`app/models/promotion_code.rb`)
+
+#### Code Validation and Application
+- **Real-time Validation**: Check code validity, expiration, and usage limits
+- **Discount Calculation**: Apply fixed amount discounts to order totals
+- **Usage Tracking**: Increment usage counters and prevent overuse
+- **Event-Specific Codes**: Support for both global and event-specific codes
+
+```ruby
+def valid_for_use?(user = nil, event = nil)
+  return false unless active?
+  return false if expired?
+  return false if usage_limit_reached?
+  return false if user.present? && !valid_for_user?(user)
+  return false if event.present? && !valid_for_event?(event)
+  true
+end
+
+def apply_discount(total_amount)
+  [total_amount - discount_amount_cents, 0].max
+end
+```
+
+### 5. Background Job Architecture
+
+#### StripeInvoiceGenerationJob
+- Async invoice creation after successful payment
+- Retry logic with exponential backoff
+- Error handling and logging
+
+#### ExpiredOrdersCleanupJob
+- Automatic cleanup of expired draft orders
+- Database maintenance and hygiene
+
+#### EventReminderJob & EventReminderSchedulerJob
+- Automated event reminder emails
+- Scheduled notifications for upcoming events
+
+### 6. PDF Ticket Generation (`app/services/ticket_pdf_generator.rb`)
 
 ```ruby
 class TicketPdfGenerator
@@ -148,10 +284,10 @@ class TicketPdfGenerator
       pdf.fill_color "2D1B69"
       pdf.font "Helvetica", style: :bold, size: 24
       pdf.text "ApéroNight", align: :center
-      
+
       # Event details
       pdf.text ticket.event.name, align: :center
-      
+
       # QR Code generation
       qr_code_data = {
         ticket_id: ticket.id,
@@ -159,7 +295,7 @@ class TicketPdfGenerator
         event_id: ticket.event.id,
         user_id: ticket.user.id
       }.to_json
-      
+
       qrcode = RQRCode::QRCode.new(qr_code_data)
       pdf.print_qr_code(qrcode, extent: 120, align: :center)
     end.render
@@ -167,12 +303,20 @@ class TicketPdfGenerator
 end
 ```
 
-### 4. Frontend Cart Management (`app/javascript/controllers/ticket_cart_controller.js`)
+### 7. Frontend Architecture
 
-- **Stimulus Controller**: Manages cart state and interactions
-- **Authentication Check**: Validates user login before checkout
-- **Session Storage**: Preserves cart when redirecting to login
-- **Dynamic Updates**: Real-time cart total and ticket count updates
+#### Enhanced Stimulus Controllers
+- **ticket_selection_controller.js**: Advanced cart management with real-time updates
+- **event_form_controller.js**: Dynamic event creation with location services
+- **countdown_controller.js**: Order expiration countdown timers
+- **event_duplication_controller.js**: Event copying functionality
+- **qr_code_controller.js**: QR code display and scanning
+
+#### Order-Based Cart Management
+- **Session Storage**: Preserves cart state during authentication flows
+- **Real-time Updates**: Dynamic total calculation with promotion codes
+- **Validation**: Client-side validation with server-side verification
+- **Payment Flow**: Seamless integration with Stripe checkout
 
 ## 🔧 Development Patterns
 
@@ -180,11 +324,21 @@ end
 ```ruby
 # Event validations
 validates :name, presence: true, length: { minimum: 3, maximum: 100 }
-validates :latitude, numericality: { 
-  greater_than_or_equal_to: -90, 
-  less_than_or_equal_to: 90 
+validates :latitude, numericality: {
+  greater_than_or_equal_to: -90,
+  less_than_or_equal_to: 90
 }
 
+# Order validations with state management
+validates :status, presence: true, inclusion: { in: %w[draft pending_payment paid completed cancelled expired] }
+validate :order_not_expired, on: :create
+before_validation :set_expiration, on: :create
+
+# Promotion code validations
+validates :code, presence: true, uniqueness: true
+validates :discount_amount_cents, numericality: { greater_than_or_equal_to: 0 }
+validate :expiration_date_cannot_be_in_the_past
+
 # Ticket QR code generation
 before_validation :generate_qr_code, on: :create
 def generate_qr_code
@@ -200,11 +354,47 @@ end
 # Authentication for sensitive actions
 before_action :authenticate_user!, only: [:checkout, :payment_success, :download_ticket]
 
-# Strong parameters
+# Professional user authorization
+before_action :authenticate_professional!, only: [:create_promotion_code]
+
+# Strong parameters with nested attributes
 private
-def event_params
-  params.require(:event).permit(:name, :description, :venue_name, :venue_address, 
-                                :latitude, :longitude, :start_time, :image)
+def order_params
+  params.require(:order).permit(:promotion_code, order_items_attributes: [:ticket_type_id, :quantity])
+end
+
+# Platform fee calculation
+def calculate_platform_fee
+  ticket_count = order_items.sum(:quantity)
+  self.platform_fee_cents = 50 + (total_amount_cents * 0.015).to_i
+end
+```
+
+### Service Layer Patterns
+```ruby
+# Service for complex business logic
+class StripeInvoiceService
+  def initialize(order)
+    @order = order
+  end
+
+  def call
+    customer = find_or_create_stripe_customer
+    create_invoice_items(customer)
+    generate_invoice
+  end
+
+  private
+
+  def find_or_create_stripe_customer
+    if @order.user.stripe_customer_id.present?
+      Stripe::Customer.retrieve(@order.user.stripe_customer_id)
+    else
+      customer = Stripe::Customer.create(email: @order.user.email)
+      @order.user.update(stripe_customer_id: customer.id)
+      customer
+    end
+  end
 end
 ```
 
@@ -212,6 +402,7 @@ end
 - **Metric Cards**: Reusable component for dashboard statistics
 - **Event Items**: Consistent event display across pages
 - **Flash Messages**: Centralized notification system
+- **Order Components**: Reusable order display and management components
 
 ## 🚀 Deployment Considerations
 
@@ -223,14 +414,28 @@ STRIPE_SECRET_KEY=sk_live_...
 STRIPE_WEBHOOK_SECRET=whsec_...
 DATABASE_URL=mysql2://user:pass@host/db
 RAILS_MASTER_KEY=...
+
+# Rails 8 Solid Stack
+SOLID_QUEUE_IN_PUMA=true
+SOLID_CACHE_URL=redis://localhost:6379/0
+SOLID_CABLE_URL=redis://localhost:6379/1
+
+# Application Configuration
+PLATFORM_FEE_FIXED_CENTS=50
+PLATFORM_FEE_PERCENTAGE=1.5
+ORDER_EXPIRATION_MINUTES=15
 ```
 
 ### Database Indexes
 ```sql
 -- Performance indexes for common queries
 CREATE INDEX idx_events_published_start_time ON events (state, start_time);
+CREATE INDEX idx_orders_user_status ON orders (user_id, status);
+CREATE INDEX idx_orders_expires_at ON orders (expires_at) WHERE status = 'draft';
 CREATE INDEX idx_tickets_user_status ON tickets (user_id, status);
 CREATE INDEX idx_ticket_types_event ON ticket_types (event_id);
+CREATE INDEX idx_promotion_codes_code ON promotion_codes (code);
+CREATE INDEX idx_promotion_codes_active_expires ON promotion_codes (active, expires_at);
 ```
 
 ### Security Considerations
@@ -238,22 +443,68 @@ CREATE INDEX idx_ticket_types_event ON ticket_types (event_id);
 - **Strong Parameters**: All user inputs filtered
 - **Authentication**: Devise handles session security
 - **Payment Security**: Stripe handles sensitive payment data
+- **Professional User Authorization**: Role-based access control for event promoters
+- **Order Expiration**: Automatic cleanup of abandoned orders
+- **Promotion Code Validation**: Server-side validation with usage limits
+
+### Background Jobs
+```ruby
+# Async invoice generation
+StripeInvoiceGenerationJob.perform_later(order_id)
+
+# Cleanup expired orders
+ExpiredOrdersCleanupJob.perform_later
+
+# Event reminders
+EventReminderSchedulerJob.set(wait_until: event.start_time - 2.hours).perform_later(event_id)
+```
+
+## 🌐 API Layer
+
+### RESTful Endpoints
+```ruby
+# API Namespacing for external integrations
+namespace :api do
+  namespace :v1 do
+    resources :events, only: [:index, :show] do
+      resources :ticket_types, only: [:index]
+    end
+
+    resources :carts, only: [:create, :show, :update]
+    resources :orders, only: [:create, :show, :update]
+
+    post '/promotion_codes/validate', to: 'promotion_codes#validate'
+  end
+end
+```
+
+### API Authentication
+- **Token-based authentication**: API tokens for external integrations
+- **Rate limiting**: Request throttling for API endpoints
+- **Versioning**: Versioned API namespace for backward compatibility
 
 ## 🧪 Testing Strategy
 
 ### Key Test Cases
 1. **User Authentication**: Registration, login, logout flows
-2. **Event Creation**: Validation, state management, relationships
-3. **Booking Process**: Cart validation, payment processing, ticket generation
-4. **PDF Generation**: QR code uniqueness, ticket format
-5. **Dashboard Metrics**: Query accuracy, performance
+2. **Professional User Onboarding**: Multi-step onboarding process
+3. **Event Creation**: Validation, state management, relationships
+4. **Order Management**: Cart-to-order conversion, payment processing, expiration
+5. **Promotion Code System**: Code validation, discount application, usage tracking
+6. **PDF Generation**: QR code uniqueness, ticket format
+7. **Stripe Integration**: Payment processing, invoice generation
+8. **Background Jobs**: Async processing, error handling, retry logic
+9. **API Endpoints**: RESTful API functionality and authentication
+10. **Dashboard Metrics**: Query accuracy, performance
 
 ### Seed Data Structure
 ```ruby
-# Creates test users, events, and ticket types
+# Creates comprehensive test data
 users = User.create!([...])
 events = Event.create!([...])
 ticket_types = TicketType.create!([...])
+promotion_codes = PromotionCode.create!([...])
+orders = Order.create!([...])
 ```
 
 ## 🛠️ Available Development Tools
@@ -280,6 +531,9 @@ ast-grep --pattern 'validates :$FIELD, presence: true' --lang ruby
 
 # Mass rename across multiple files
 ast-grep --pattern 'old_method_name($$$ARGS)' --rewrite 'new_method_name($$$ARGS)' --lang ruby --update-all
+
+# Find all order-related validations
+ast-grep --pattern 'validates :status, inclusion: { in: \%w[...] }' --lang ruby
 ```
 
 #### Best Practices:
@@ -288,13 +542,25 @@ ast-grep --pattern 'old_method_name($$$ARGS)' --rewrite 'new_method_name($$$ARGS
 - Test changes in a branch before applying to main codebase
 - Particularly useful for Rails conventions and ActiveRecord pattern updates
 
+### Modern Rails 8 Stack
+- **Solid Queue**: Background job processing
+- **Solid Cache**: Fast caching layer
+- **Solid Cable**: Action Cable over Redis
+- **Propshaft**: Asset pipeline
+- **Kamal**: Deployment tooling
+- **Thruster**: Performance optimization
+
 ## 📝 Code Style & Conventions
 
 - **Ruby Style**: Follow Rails conventions and Rubocop rules
 - **Database**: Use Rails migrations for all schema changes
 - **JavaScript**: Stimulus controllers for interactive behavior
 - **CSS**: Tailwind utility classes with custom components
+- **Service Layer**: Complex business logic in service objects
+- **Background Jobs**: Async processing for long-running tasks
+- **API Design**: RESTful principles with versioning
 - **Documentation**: Inline comments for complex business logic
 - **Mass Changes**: Use `ast-grep` for structural code replacements instead of simple find/replace
+- **Testing**: Comprehensive test coverage for all business logic
 
-This architecture provides a solid foundation for a scalable ticket selling platform with proper separation of concerns, security, and user experience.
\ No newline at end of file
+This architecture provides a solid foundation for a scalable ticket selling platform with proper separation of concerns, security, and user experience, featuring modern Rails 8 capabilities and a comprehensive order management system.
\ No newline at end of file
diff --git a/app/controllers/orders_controller.rb b/app/controllers/orders_controller.rb
index f6a6e29..b3f572c 100644
--- a/app/controllers/orders_controller.rb
+++ b/app/controllers/orders_controller.rb
@@ -130,11 +130,16 @@ class OrdersController < ApplicationController
     if params[:promotion_code].present?
       promotion_code = PromotionCode.valid.find_by(code: params[:promotion_code].upcase)
       if promotion_code
-        # Apply the promotion code to the order
-        @order.promotion_codes << promotion_code
-        @order.calculate_total!
-        @total_amount = @order.total_amount_cents
-        flash.now[:notice] = "Code promotionnel appliqué: #{promotion_code.code}"
+        # Check if promotion code is already applied to this order
+        if @order.promotion_codes.include?(promotion_code)
+          flash.now[:alert] = "Ce code promotionnel est déjà appliqué à cette commande"
+        else
+          # Apply the promotion code to the order
+          @order.promotion_codes << promotion_code
+          @order.calculate_total!
+          @total_amount = @order.total_amount_cents
+          flash.now[:notice] = "Code promotionnel appliqué: #{promotion_code.code}"
+        end
       else
         flash.now[:alert] = "Code promotionnel invalide"
       end
@@ -302,7 +307,14 @@ class OrdersController < ApplicationController
   end
 
   def create_stripe_session
+    # Calculate the discount amount per ticket to distribute the promotion evenly
+    total_tickets = @order.tickets.count
+    discount_per_ticket = @order.discount_amount_cents / total_tickets if total_tickets > 0
+
     line_items = @order.tickets.map do |ticket|
+      # Apply discount proportionally to each ticket
+      discounted_price = [ticket.price_cents - discount_per_ticket.to_i, 0].max
+
       {
         price_data: {
           currency: "eur",
@@ -310,7 +322,7 @@ class OrdersController < ApplicationController
             name: "#{@order.event.name} - #{ticket.ticket_type.name}",
             description: ticket.ticket_type.description
           },
-          unit_amount: ticket.price_cents
+          unit_amount: discounted_price
         },
         quantity: 1
       }
diff --git a/app/models/order.rb b/app/models/order.rb
index 8fea6d7..7034161 100644
--- a/app/models/order.rb
+++ b/app/models/order.rb
@@ -21,6 +21,9 @@ class Order < ApplicationRecord
   validates :payment_attempts, presence: true,
     numericality: { greater_than_or_equal_to: 0 }
 
+  # Custom validation to prevent duplicate promotion codes
+  validate :no_duplicate_promotion_codes
+
   # Stripe invoice ID for accounting records
   attr_accessor :stripe_invoice_id
 
@@ -188,4 +191,12 @@ class Order < ApplicationRecord
   def draft?
     status == "draft"
   end
+
+  # Prevent duplicate promotion codes on the same order
+  def no_duplicate_promotion_codes
+    promotion_code_ids = promotion_codes.map(&:id)
+    if promotion_code_ids.size != promotion_code_ids.uniq.size
+      errors.add(:promotion_codes, "ne peuvent pas contenir de codes en double")
+    end
+  end
 end