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Simple headless list updater

Hi there. I'm an absolute newbie and am really struggling with this.

All I need is a simple headless list item updater which appends the users name to a Sharepoint Online field when a user clicks on a URL.



1. I need to create a headless (screenless) app (or a simple non-interactive screen: "Updating Record" or something like that)

2. The app needs to connect to my sharepoint list.

3. The app needs to read the ID from the URL eg

4. The app needs to get the username

5. The app needs to append the username to the string in field "x" of the relevant list item

6. Some kind of confirmation "Completed, thanks" etc.


I just don't know where to start, and everything I look at is gobbledygook! Any help would be very much appreciated.



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