add steps

api.saladeaula.digital/app/routes/orders/checkout.py

@@ -52,6 +52,12 @@ class Item(BaseModel):
     quantity: int = 1
 
 
+class Coupon(BaseModel):
+    code: str
+    type: Literal['PERCENT', 'FIXED']
+    amount: Decimal
+
+
 class Checkout(BaseModel):
     model_config = ConfigDict(str_strip_whitespace=True)
 
@@ -60,6 +66,7 @@ class Checkout(BaseModel):
     address: Address
     payment_method: Literal['PIX', 'CREDIT_CARD', 'BANK_SLIP', 'MANUAL']
     items: tuple[Item, ...]
+    coupon: Coupon | None = None
     user: User | None = None
     org_id: UUID4 | str | None = None
     user_id: UUID4 | str | None = None