python

from fastapi import FastAPI
from pydantic import BaseModel
import stripe

# --------------------
# APP CONFIG
# --------------------
app = FastAPI()

stripe.api_key = "sk_test_your_key_here"

# --------------------
# MODELS
# --------------------
class Product(BaseModel):
    id: int
    name: str
    price: int  # cents
    stock: int

class CartItem(BaseModel):
    product_id: int
    quantity: int

class Order(BaseModel):
    items: list[CartItem]

# --------------------
# FAKE DATABASE
# --------------------
products = {
    1: {"name": "Laptop", "price": 100000, "stock": 5},
    2: {"name": "Phone", "price": 50000, "stock": 10}
}

cart = []

# --------------------
# PRODUCT APIs
# --------------------
@app.get("/products")
def get_products():
    return products

# --------------------
# CART APIs
# --------------------
@app.post("/cart/add")
def add_to_cart(item: CartItem):
    cart.append(item)
    return {"message": "Item added to cart"}

@app.get("/cart")
def view_cart():
    return cart

# --------------------
# ORDER + PAYMENT
# --------------------
@app.post("/order")
def create_order(order: Order):
    total_amount = 0

    for item in order.items:
        product = products[item.product_id]
        total_amount += product["price"] * item.quantity

    payment = stripe.PaymentIntent.create(
        amount=total_amount,
        currency="usd",
        payment_method_types=["card"]
    )

    return {
        "message": "Order created",
        "total_amount": total_amount,
        "payment_client_secret": payment.client_secret
    }