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Booking.com stopped sending guest phone numbers to connectivity providers on Monday 28 September. If you run units through a channel manager or a property management system, it is worth checking today rather than next week.
From Booking's own connectivity changelog:
"The Reservations API no longer includes phone numbers of guests globally as of September 28, 2026."
The migration guide, dated 23 September, is wider than that line suggests. From 28 September all new reservation payloads omit the number, including payloads for past-dated bookings, modifications and cancellations. Numbers already…
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