https://docs.cloud.google.com/php/docs/reference/cloud-storage-transfer/latest/V1.S3CompatibleMetadata
Google Cloud Storage Transfer V1 Client - Class S3CompatibleMetadata (2.4.0) | PHP client libraries...
google cloud storage
https://docs.cloud.google.com/nodejs/docs/reference/storage-transfer/latest/storage-transfer/protos.google.storagetransfer.v1.s3compatiblemetadata.authmethod
Enum protos.google.storagetransfer.v1.S3CompatibleMetadata.AuthMethod (4.1.0) | Node.js client...