Retrieves scheduled payments for the account.
UUID of the service account (e.g., 550e8400-e29b-41d4-a716-446655440000)
Unix timestamp in milliseconds (e.g., 1704636800000). Must be within 5 minutes of server time.
Must be 'service-account' for service account authentication
EdDSA signature of the request in base64 format. Signs: uri:method:body:timestamp
x >= 0pending, processing, executed, failed, cancelled