Merge Profiles with identical passport/id number
Merging profile with email is fine.
But we could improve it by merging it on basis of the passport/ID number. This way, a booking.com guest would be merged and seen as a returning guest.

Hello from the Mews product team. Unfortunately, this request has not received the necessary upvotes to be added to the Mews development roadmap and is unlikely to be delivered. Thank you for sharing your suggestions.
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Christian Furtner commented
I suggest merging based on the telephone number since the phone number is already entered by the guest when making the reservation.
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Nikoloz Cherkezishvili commented
Should offer merge with phone number as well
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Daniel Healy commented
Additional to passport/ID numbers, Mews could look for other identifiers such as phone number. Mews could then `suggest` the user to merge the two profiles. This would be a massive differentiator.
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Benoit Thewys commented
This would be a major benefit and should not cost a lot of development.