public void processPayment(WorkflowThread wf) {
  WfRunVar paymentId = wf.declareStr("payment-id").required();
  WfRunVar amount = wf.declareDecimal("amount").required();
  
  // Authorize payment
  NodeOutput authResult = wf.execute("authorize-payment", paymentId, amount)
    .withRetries(3);
  
  // Check fraud
  NodeOutput fraudCheck = wf.execute("fraud-check", paymentId)
    .withRetries(2);
  
  // Process if approved
  wf.doIf(
    wf.condition("is-approved", authResult, fraudCheck),
    ifBody -> {
      ifBody.execute("settle-payment", paymentId, amount);
      ifBody.execute("send-notification", paymentId);
    }
  );
}