The One-Time Notification API (application-programming interface) for Messenger From Facebook, initially discussed last December, is now available in beta.
Product manager Igor Slutsker revealed the API’s availability in a blog post, saying that it can be used to support valuable use cases like price drop alerts, back in stock alerts and other important follow-ups that people have requested notifications for.
He provided the following example: “A person is shopping for a shirt, but it’s out of stock.
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