Download page for lap data

You can export it to the CSV file manually on the page https://connect.garmin.com/modern/activity/4549671491 by selecting the option "Export Splits to CSV" in the cogwheel menu. If you need to access it programmatically, then my first bet would be on the two-way verification being recently enabled on your GC account (i.e. because of the ECG functionality), and hence the URL is no more directly accessible by the script.

You're right, the direct link alone doesn't work anymore, gives 402 error.

Now it needs some additional headers.

So you can download from the page using the ️ button, or write a script with added headers.

Jannie said:

I can send the 2 CSV files resulting from both web locations, but I don't know how to do that in this forum...

• Zip the CSV files, then in a reply post Insert >> Image/video/file >> click Upload >> browse for file >> OK.
• Or upload the files to a reputable file sharing service, such as OneDrive, Google Drive, Dropbox, make the file public, then paste a link to the files in your post.

Well, it's known that those CSV are different, anybody can check own files, so uploading some rather won't give more info.

User wanted to know how, so posted instructions. Whether or not that leads to anything, is a different story.

And for a script you need DI-Backend and Authorization headers. This prints to console:

jQuery.ajax({
    headers: {'DI-Backend':'connectapi.garmin.com', 'Authorization':'Bearer ' + JSON.parse(localStorage.token).access_token},
    url: 'https://connect.garmin.com/download-service/export/csv/activity/***ID***',
    success: (i) => {console.log(i)}
})

You can check headers in DevTools (F12) → Network, just by comparing how other files were downloaded. Also there is option Copy as Fetch to copy some request which you can modify or re-use.

Don't see option to download CSV in that other format using just the website, so it's either a script or asking the support to change the format from the export menu.

activity_12380355450 2 files.zip

Thank you for this post. It fixed the issue I had with my Chrome extension and works perfectly!

What Chrome extension do you mean?