Create Interoperability Keys for Google Cloud Storage Bucket
Interoperability keys, also called HMAC (Hash-based Message Authentication Code) keys, are credentials that you associate with a Google Cloud service or user account. We recommend using a Google Cloud service account with HMAC keys for production workloads.
To create an HMAC key for service account:
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In Google Cloud Storage Platform click Cloud Storage.
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Under Cloud Storage, click Settings.
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On the Interoperability tab, click Service account HMAC.
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Click Create a Key.