The service in question is called SnapMemories, and the feature is so easy that all you have to do in signing up is to enter your first and last name, your Snapchat username and an email address, and then add "mysnapmemories0" on the app.
That gives the service permission to see and save your stories (but they're assuring users they aren't interested in looking at your Snaps, personally) and on the first day of the month you'll be emailed through a link to download your previous month's content.
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