How To Request For One Time Notification Permission In Facebook Page
How To Request For One Time Notification ( OTN ) Permission In Facebook Page
API Details : / one-time-notification
The Messenger Platform's One-Time Notification API (Beta) allows a page to request a user to send one follow-up message after 24-hour messaging window have ended. The user will be offered to receive a future notification. Once the user asks to be notified, the page will receive a token which is an equivalent to a permission to send a single message to the user. The token can only be used once and will expire within 1 year of creation.
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