Return the latest status for a swap created with your API key.
API key. Keep this key on your backend.
LightSwap swap ID returned by POST /swap.
^[A-Z0-9]{12}$"AB12CD34EF56"
Latest swap status.
^[A-Z0-9]{12}$"AB12CD34EF56"
"partner-order-123"
waiting_deposit, deposit_detected, underpaid, processing, completed, refunded, failed, expired "u_123"