public Builder mergeFrom(com.google.cloud.vertexai.api.ApiAuth.ApiKeyConfig other) {
        if (other == com.google.cloud.vertexai.api.ApiAuth.ApiKeyConfig.getDefaultInstance())
          return this;
        if (!other.getApiKeySecretVersion().isEmpty()) {
          apiKeySecretVersion_ = other.apiKeySecretVersion_;
          bitField0_ |= 0x00000001;
          onChanged();
        }
        this.mergeUnknownFields(other.getUnknownFields());
        onChanged();
        return this;
      }
<pre>
The API secret.
</pre>

Protobuf type {@code google.cloud.vertexai.v1.ApiAuth.ApiKeyConfig}
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/ApiAuth.java