FastComments comment widget

One tenantId and a container element is the whole install. Everything else is optional configuration.

Essentials

• tenantId - your account ID, from https://fastcomments.com/auth/my-account/api-secret. Public, safe in browser code. Use "demo" to try it with no account.
• region: "eu" - required if the account was created on https://eu.fastcomments.com, omit otherwise.
• urlId - which thread the comments belong to. Read the next section before shipping.
• The API key is never needed by a widget. If you find yourself putting one in browser code, stop.
• A new account with no configured domains refuses to load the widget. Set the allowed domains first.

urlId: the thing people get wrong

urlId decides which thread a comment lands in. Left unset it defaults to a cleaned version of the current page URL, which means a query string, a trailing slash, a locale prefix, or a staging domain each silently create a separate, empty thread. The symptom is "my comments disappeared".