LIFF(LINE Front-end Framework) command line tool, plus a server api wrapper in python https://developers.line.me/en/docs/liff/overview/

to save access token locally for later use

$ liff.py init {LINE_LIFF_ACCESS_TOKEN}

list all registered LINE LIFF apps

$ liff.py list

register a new LINE LIFF app

(type can be: full, tall, compact)

$ liff.py  add <url> <type>

delete an existing LINE LIFF app

$ liff.py delete <liff-id>

$ liff.py update <liff-id> <json_string>