public Builder clearAuthMethod() {
        bitField0_ = (bitField0_ & ~0x00000001);
        authMethod_ = 0;
        onChanged();
        return this;
      }
<pre>
Specifies the authentication and authorization method used by the storage
service. When not specified, Transfer Service will attempt to determine
right auth method to use.
</pre>

<code>.google.storagetransfer.v1.S3CompatibleMetadata.AuthMethod auth_method = 1;</code>

@return This builder for chaining.
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java