curl -X POST https://api.khaime.com/api/v1/partner/refunds \
  -H "X-API-Key: pk_sandbox_your_key" \
  -H "Content-Type: application/json" \
  -d '{
    "transaction_id": "456",
    "amount": 2500,
    "reason": "Customer requested refund"
  }'

{
  "success": true,
  "data": {
    "refund_id": "ref_abc123",
    "status": "processing",
    "amount": 2500,
    "currency": "USD"
  }
}