API

curl -X POST https://api.pay.halochat.io/api/v1/transactions/pay \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "amount": "100.00",
    "currency": "USD",
    "order_id": "ORD-123",
    "callback_url": "https://your-site.com/callback"
  }'