Free Account Creation and Official LINE Documentation Guide
You can open an official LINE account for free. If you haven't opened an account yet, please do so from the URL below.
Open an account:
https://www.linebiz.com/jp/entry/
For more information on how to set up an account, please refer to the documentation provided by LINE.
How to Create an Official LINE Account｜Setting Up and Operating an Official LINE Account:
https://www.linebiz.com/jp/column/technique/20190418-3/
Next: Enable Messaging API