export async function onRequestPost({ request, env }) {
 const { orderId, txHash } = await request.json()

 const order = await env.DB.prepare(
  "SELECT total FROM orders WHERE id=?"
 ).bind(orderId).first()

 if(!order) return new Response("Order not found",{status:404})

 const tx = await fetch(
  `${env.TON_API}/getTransactions?address=${env.TON_RECEIVER}&limit=20`
 )

 const data = await tx.json()

 const found = data.result.find(t=>t.transaction_id.hash===txHash)

 if(!found) return new Response("Transaction not found",{status:400})

 const amount = Number(found.in_msg.value)/1e9

 if(amount < order.total)
   return new Response("Amount mismatch",{status:400})

 await env.DB.prepare(
  "UPDATE orders SET status='paid', tx_hash=? WHERE id=?"
 ).bind(txHash,orderId).run()

 return Response.json({success:true})
}