Reschedule Message

Reschedules a scheduled message by updating its send_at time. The message cannot have been sent or cancelled, must be more than one minute from its current send time, and the new send time must be in the future. Submit send_at as an ISO 8601/ATOM datetime with the intended timezone offset; the API converts it to UTC for storage.

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Path Params
integer
required

The ID of the message to reschedule.

Body Params

Body Params

date-time
required

New send time. Submit an ISO 8601/ATOM datetime with the intended timezone offset, e.g. 2026-05-03T12:30:00-04:00. Must be in the future; the API converts it to UTC for storage.

Responses
200

The rescheduled message

406

The message is too close to its current send time to be rescheduled.

422

The message has already been sent, was cancelled, or the new send time is not in the future.

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