Line is free service but Notify service is discontinued and may not work anymore.
Considering you have line account and you already installed line on you phone/PC:
1 - Go to https://notify-bot.line.me/my/ and connect with email and password
2 - Once connected you will be able to generate token
3 - Type token name on top, select recipient(s) and press Generate token
4 - Once token is created you need to copy it
5 - You can create as many tokens you want, and delete the ones you do not need
6 - Save the generate token in ESP3D, and set LINE as notification supplier
[ESP610]type=LINE T1=xxxxxxxxxxxxxxxxxx
7 - type [ESP610] to verify (T1 won’t be displayed)
8 - Try to send message:
[ESP600]Hi there, test from ESP3D