I subscribe to Monzo Perks, and have my other credit cards in the app, although the only card I use regularly that isn’t my Flex card, is the Yonder card; are there any plans to integrate this card with Monzo?
I think that’s a question for Yonder? Monzo uses the (I believe) industry standard open banking protocols to link other accounts into the Monzo App.
Yonder will need to set themselves up to use Open Banking as well.
Correct. Yonder need to support open banking 
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