Describes the cause and action for error messages.
Error Message(English)：
how to cancel github subscription
Removing paid seats from ...
https://help.github.com/en/articles/downgrading-your-github-billing-plan#removing-paid-seats-from-yo・・・
Downgrading an ...
https://help.github.com/en/articles/downgrading-your-github-billing-plan#downgrading-an-organization・・・
Canceling a GitHub Marketplace app - GitHub Help
https://help.github.com/en/articles/canceling-a-github-marketplace-app
How to cancel a subscription ・ opencollective/opencollective ... - GitHub
https://github.com/opencollective/opencollective/wiki/How-to-cancel-a-subscription
Managing your GitHub billing settings - GitHub Help
https://help.github.com/en/articles/managing-your-github-billing-settings
Downgrading the billing plan for a GitHub Marketplace app - GitHub ...
https://help.github.com/en/articles/downgrading-the-billing-plan-for-a-github-marketplace-app
Subscribing to and unsubscribing from notifications - GitHub Help
https://help.github.com/en/articles/subscribing-to-and-unsubscribing-from-notifications
About billing for GitHub Marketplace - GitHub Help
https://help.github.com/en/articles/about-billing-for-github-marketplace
Upgrading or downgrading your client's paid organization - GitHub Help
https://help.github.com/en/articles/upgrading-or-downgrading-your-clients-paid-organization