The plugin serves the files from the .well-known folder of your store, so you could verify your domain for Apple Pay and Let's Encrypt and publish the Apple universal links file.
It's easy to configure the plugin. See pictures.
1. Install the plugin. There is nothing to configure. The plugin has no configure page and no settings, it works right after the installation.

2. Create the folder '.well-known' in the folder 'wwwroot' or in the nopCommerce root folder. If you can't create a folder with a dot then create the folder 'well-known' without the dot. The plugin supports both.
Copy the file into this folder and keep its exact name. Do not add an extension.
Example. Apple Pay. Download the file 'apple-developer-merchantid-domain-association' from your Apple Developer account and copy it to 'wwwroot\.well-known'.

3. Files in a subfolder work too.
Example. Let's Encrypt. Create the folder 'acme-challenge' in the folder '.well-known' and copy the file there.

We advise you to use this program for working with Let's Encrypt.
https://certifytheweb.com
4. The file 'apple-app-site-association' and the files with the extension .json are sent as 'application/json'. All other files are sent as 'text/plain'.
Example. Apple universal links. Copy the file 'apple-app-site-association' to 'wwwroot\.well-known'.

5. Open the URL of the file in your browser before you start the verification. You should see the content of the file. If the file is missing then you get the text '404 - File not found'. Check the folder and the name of the file.
The files stay reachable when the store is closed or requires login. The plugin does not redirect these URLs to https, to www or to a language URL.
Anyone could read the files from this folder. Do not put private files there.