feat: implement payout system database schema and models

app/models/order.rb

@@ -32,6 +32,7 @@ class Order < ApplicationRecord
   }
 
   before_validation :set_expiry, on: :create
+  after_update :create_earnings_if_paid, if: -> { saved_change_to_status? && status == "paid" }
 
   # === Instance Methods ===
 
@@ -159,7 +160,33 @@ class Order < ApplicationRecord
     self.expires_at = DRAFT_EXPIRY_TIME.from_now if expires_at.blank?
   end
 
-  def draft?
-    status == "draft"
+def draft?
+  status == "draft"
+end
+
+def create_earnings_if_paid
+  return unless event.present? && user.present?
+  return if event.earnings.exists?(order_id: id)
+
+  event.earnings.create!(
+    user: user,
+    order: self,
+    amount_cents: promoter_payout_cents,
+    fee_cents: platform_fee_cents,
+    status: :pending
+  )
+end
+
+  def create_earnings_if_paid
+    return unless event.present? && user.present?
+    return if event.earnings.exists?(order_id: id)
+
+    event.earnings.create!(
+      user: user,
+      order: self,
+      amount_cents: promoter_payout_cents,
+      fee_cents: platform_fee_cents,
+      status: :pending
+    )
   end
 end