diff --git a/.forge/BAIS-POLICY-1783705261-attempt-2.md b/.forge/BAIS-POLICY-1783705261-attempt-2.md
new file mode 100644
index 0000000..a0f3663
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+++ b/.forge/BAIS-POLICY-1783705261-attempt-2.md
@@ -0,0 +1,3 @@
+# BAIS-POLICY-1783705261-attempt-2
+
+Forge 이슈 작업 브랜치 `forge/BAIS-POLICY-1783705261-attempt-2`.
diff --git a/src/main/java/com/example/baispolicy/PaymentService.java b/src/main/java/com/example/baispolicy/PaymentService.java
new file mode 100644
index 0000000..55047c9
--- /dev/null
+++ b/src/main/java/com/example/baispolicy/PaymentService.java
@@ -0,0 +1,10 @@
+package com.example.baispolicy;
+
+public class PaymentService {
+    public String approve(String transactionId) {
+        if (transactionId == null || transactionId.isBlank()) {
+            throw new IllegalArgumentException("transactionId cannot be blank");
+        }
+        return "APPROVED:" + transactionId;
+    }
+}
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