   // Prepare expense data
  }

  public async execAsync(_: void): Promise&lt;void&gt; {
    // Execute review logic
  }

  public async postAsync(sharedState: any, prepResult: void, execResult: void): Promise&lt;string&gt; {
    // Example decision logic
    const decision = &quot;approved&quot;; // Replace with actual decision-making
    return decision;
  }
}

// Define PaymentNode
class PaymentNode extends BaseNode {
  public async prepAsync(sharedState: any): Promise&lt;void&gt; {
    // Prepare paymen