When using the holidaymaker app surfaces you would need to create both an Apple App Store Developer account, and a Google Play Store Developer account. You also need a Google Firebase account which is used for push notifications and usage analytics.
Once these accounts are setup you can then give the holidaymaker projects and development team access to these. This can be on a full access basis which allows us to setup things as needed, or can be on a granular access basis to allow us access to just the things we need.
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When creating these accounts you will also need to provide API access to both Apple and Google infrastructures so we can programmatically fetch download reports, and monitor current versions on the stores. This is also documented in these guides.