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Non-email SNS topic subscriptions can auto-confirm, in most cases. <https://www.pulumi.com/docs/reference/pkg/aws/sns/topicsubscription/#endpointautoconfirms_nodejs>

what does auto-confirm do?
does that mean the endpoint must respond to the confirmation request?  If so, then I may be in a chicken/egg situation.

Yes, that's it. Many endpoints are created do that, but if you're writing your own one, then you'd need to add the feature.

I use SNS for sending alarms to Opsgenie, and it autoconfirms

Yeah, the API does handle the subscription, the problem, is that the API may not be available, because it hasn't been deployed as part of the stack creation.

Ah. Yes. Would it be feasible to move the subscription into the API's stack?

I don't have a separate stack per api  - it's one uber stack