This incident has been resolved.

Looks like Facebook has fixed the issue, but we're still monitoring the results. All our systems are back and functioning, but in a small percent of cases we still see some glitches from the Facebook's APIs (especially for WhatsApp). Please consider holding back any paid campaigns for now and giving Facebook some time to recover. We will be monitoring the situation and will close the issue once we're sure that Facebook with all respective Channels is operating normally.

While Facebook is down, Instagram and WhatsApp also seem to be affected globally. We recommend pausing your current campaigns and automations in these channels until further notice.