Hi @dbarnesen, thank you for asking this question.
I’m the Product Manager at Mews responsible for the Guest Portal and it’s great to hear this is a capability you’d be interested in.
The main reason this is not currently possible is that we haven’t developed the experience yet. The launch of the new Guest Portal last year enabled us to create a a much enhanced online check in experience as well as build a new foundation to continue expanding the capabilities of Guest Portal.
It is our longer-term intention to create more capabilities in Guest Portal beyond check in, such as upselling products and services or managing the reservation. However, we don’t have a firm timeline for when these will be addressed at this time.
Please do share any specific capabilities you’d like to see in our feedback portal (https://feedback.mews.com/) as we review this when planning future developments.
Please don’t hesitate to share any other questions or feedback you might have 
Thank you,
James
Hei @James.taylor thanks for your reply! So i will just be patient and wait
And of course, in an ideal world they will only be upsold for things that are not already in the reservation.
Thanks also for all the updates on the webinar today! Great to hear that Salto Space and other keys are coming to the Guest Portal / Digital Key soon.