Passwords cannot be retrieved thru restman in their plain-text form for security reasons.
To export then import it into another gateway, export using:
GET restman/1.0/bundle?password=<id>&encryptSecrets=true
header: L7-key-passphrase = <password to encrypt with>
import:
PUT restman/1.0/bundle
header: L7-key-passphrase = <same password to decrypt with>