official document
https://developers.line.biz/en/docs/line-login/
.
Someone wrote it on github, but it's not the latest version
https://github.com/osapon/oauth2-line
.
It looks like it's possible to extend fof oauth directly
https://github.com/FriendsOfFlarum/oauth
https://github.com/imorland/flarum-ext-oauth-amazon
.
I am not a programmer, but I need this function very much. If you are interested in taking the case, please quote me, thank you
.
my email: line-login@opencart.cc