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Ah found IntegrationAccount.Get() which seems to almost do what I want (though it needs a name as well as an ID)

https://www.pulumi.com/docs/reference/pkg/azure-native/logic/getintegrationaccount/ can do it with a name and a resource group

Thanks @tall-librarian-49374. I had a play with that but could only get back an getIntegrationAccount Result rather than an actual resource that I could then use when specifying it as a dependency for a logic app. IntegrationAccount.Get() seems similar but return an actual Resource so I was able to use that