Line is free service

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 image

2 - Once connected you will be able to generate token
image

3 - Type token name on top, select recipient(s) and press Generate token
image

4 - Once token is created you need to copy it
image

5 - You can create as many tokens you want, and delete the ones you do not need
image

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