This version of Unity is unsupported.
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Unity IAP

Cloud Build REST API

You can further automate and integrate Unity Cloud Build into your own custom workflows using its REST API. The API can give you additional insight into your build history and allows you to create webhook callbacks to facilitate communication between Unity Cloud Build’s servers and your own.

See the Unity Cloud Build API documentation on the Unity Cloud Build website for further details.

Build manifest as ScriptableObject
Unity IAP