I have the same issue, but only in unit tests. I use purchase(options:) method. It does work in launched app, but not in unit tests.
Arideno
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Same here, it seems that Swift does not understand which method to use because of default options and completion parameters, so I managed to use it like that:
UIApplication.shared.open(url, options: [])
But still, this is a bug and should not be like that.