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This is how you fetch it - by giving it the ARN, not the `id` -.-
```
aws.secretsmanager.getSecretVersion({
    secretId: postgresCredentials.arn,
  })```

Re: `secret_id` vs. `secretId`: they're the same thing, the docs are built from a single location but the properties are built per-language. In this case, `secret_id` is probably the name in the AWS SDK request payload. Or maybe it's the name in the Terraform implementation, and Pulumi have used the Terraform docs to start from?

Either way, read property names in error messages only vaguely; they can be approximate and slightly misleading like this.