[1] LINE Developers - BusinessConnect - Developing BusinessConnect server ( 版) <https://developers.line.me/businessconnect/development-bot-server>
X-Line-ChannelToken: Channel Access Token
[2] LINE Developers - RESTful API - Overview ( 版) <https://developers.line.me/restful-api/overview>
Authorization: Bearer Access Token
(Deprecated) X-Line-ChannelToken: Access Token