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 import os
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  import time
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  from fastapi import FastAPI, HTTPException
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  from pydantic import BaseModel
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  from mmg import MmgCheckoutUtil
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  from mmg.types import CheckoutTokenPayload
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  app = FastAPI()
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  checkout_util = MmgCheckoutUtil(
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      environment="Live",  # or "Sandbox"
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      public_key=os.getenv("MMG_PUBLIC_KEY"),
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      private_key=os.getenv("MMG_PRIVATE_KEY"),
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  )
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  class CheckoutResponse(BaseModel):
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      redirectUrl: str
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  @app.post("/api/checkout", response_model=CheckoutResponse)
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  async def create_checkout():
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      try:
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          merchant_txn_id = f"ORD-{int(time.time() * 1000)}"
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          payload = CheckoutTokenPayload(
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              secret_key=os.getenv("MMG_SECRET_KEY"),
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              merchant_id=os.getenv("MMG_MERCHANT_ID"),
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              amount="3000",  # GYD
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              merchant_transaction_id=merchant_txn_id,
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              merchant_name="My Ecommerce Store",
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              product_description="Shopping Cart Checkout",
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              request_initiation_time=str(int(time.time() * 1000)),
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          )
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          redirect_url = checkout_util.generate_redirect_url(
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              payload=payload,
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              client_id=os.getenv("MMG_CLIENT_ID"),
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          )
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          return {"redirectUrl": redirect_url}
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      except Exception as e:
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          print(f"Failed to generate checkout URL: {e}")
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          raise HTTPException(status_code=500, detail="Internal Server Error")