get https://api-wallet-sandbox.venly.io/api/signatures/
Retrieves a signature request by its unique identifier, including current status,
metadata, and signing details.
Returns information about:
- Current signature request status (SAVED, READY, SIGNED, EXPIRED, CANCELED)
- Original request parameters and data
- Timestamps (created, expires, signed)
- Signature results (if completed)
- Associated wallet and blockchain network details