Links are broken on the article

https://developer.ubuntu.com/en/apps/platform/guides/online-accounts-developer-guide/

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The app.service file describes the online service which the application will access; it needs to contain a element containing the ID of the account provider. The available account providers can be found in /usr/share/accounts/providers/ (those installed via click packages will be found in ~/.local/share/accounts/providers/), and their ID is given by their filename minus the “.provider” suffix. The app.application file needs to declare which services the application can use, and that can be done by writing the service ID (which in the typical case is the short app ID) into the “id” tag of the <service> element. More information on how to write .service and .application files can be found here. It's anyway advisable to start with a minimal file, and then extend it only once the project is proven to be working.
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In the article, the " short app ID" and "here" links are broken.