diff --git a/.forge/BAIS-CTX-1783821073-attempt-1.md b/.forge/BAIS-CTX-1783821073-attempt-4.md
similarity index 63%
rename from .forge/BAIS-CTX-1783821073-attempt-1.md
rename to .forge/BAIS-CTX-1783821073-attempt-4.md
index fa332cd..27c880c 100644
--- a/.forge/BAIS-CTX-1783821073-attempt-1.md
+++ b/.forge/BAIS-CTX-1783821073-attempt-4.md
@@ -1,3 +1,3 @@
-# BAIS-CTX-1783821073-attempt-1
+# BAIS-CTX-1783821073-attempt-4
 
-Forge 이슈 작업 브랜치 `forge/BAIS-CTX-1783821073-attempt-1`.
+Forge 이슈 작업 브랜치 `forge/BAIS-CTX-1783821073-attempt-4`.
diff --git a/pom.xml b/pom.xml
index 3a06184..d025c7b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,15 +1,22 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
     <modelVersion>4.0.0</modelVersion>
+
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>3.5.14</version>
     </parent>
+
     <groupId>com.klaro.bais</groupId>
     <artifactId>bais-platform</artifactId>
     <version>1.0-SNAPSHOT</version>
     <packaging>pom</packaging>
+
     <modules>
         <module>services/payments</module>
     </modules>
-</project>
+
+</project>
\ No newline at end of file
diff --git a/services/payments/pom.xml b/services/payments/pom.xml
index 0bddfb9..f4d20af 100644
--- a/services/payments/pom.xml
+++ b/services/payments/pom.xml
@@ -1,11 +1,16 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
     <modelVersion>4.0.0</modelVersion>
+
     <parent>
         <groupId>com.klaro.bais</groupId>
         <artifactId>bais-platform</artifactId>
         <version>1.0-SNAPSHOT</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
+
     <artifactId>payments</artifactId>
     <dependencies>
         <dependency>
@@ -13,5 +18,12 @@
             <artifactId>commons-lang3</artifactId>
             <version>3.18.0</version>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <version>3.5.14</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
-</project>
+
+</project>
\ No newline at end of file
diff --git a/services/payments/src/main/java/com/klaro/bais/payments/PaymentReferenceService.java b/services/payments/src/main/java/com/klaro/bais/payments/PaymentReferenceService.java
index 159a78d..a349b69 100644
--- a/services/payments/src/main/java/com/klaro/bais/payments/PaymentReferenceService.java
+++ b/services/payments/src/main/java/com/klaro/bais/payments/PaymentReferenceService.java
@@ -6,4 +6,4 @@ public class PaymentReferenceService {
     public String normalize(String input) {
         return StringUtils.trimToEmpty(input);
     }
-}
+}
\ No newline at end of file
diff --git a/services/payments/src/test/java/com/klaro/bais/payments/PaymentReferenceServiceTest.java b/services/payments/src/test/java/com/klaro/bais/payments/PaymentReferenceServiceTest.java
index ee30f15..b363d79 100644
--- a/services/payments/src/test/java/com/klaro/bais/payments/PaymentReferenceServiceTest.java
+++ b/services/payments/src/test/java/com/klaro/bais/payments/PaymentReferenceServiceTest.java
@@ -1,28 +1,24 @@
 package com.klaro.bais.payments;
 
 import org.junit.jupiter.api.Test;
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 class PaymentReferenceServiceTest {
-    private final PaymentReferenceService paymentReferenceService = new PaymentReferenceService();
+
+    private final PaymentReferenceService service = new PaymentReferenceService();
 
     @Test
-    void testNormalize_NullInput() {
-        assertEquals("", paymentReferenceService.normalize(null));
+    void testNormalizeNull() {
+        assertEquals("", service.normalize(null));
     }
 
     @Test
-    void testNormalize_EmptyInput() {
-        assertEquals("", paymentReferenceService.normalize(""));
+    void testNormalizeEmpty() {
+        assertEquals("", service.normalize("  "));
     }
 
     @Test
-    void testNormalize_WhitespaceInput() {
-        assertEquals("", paymentReferenceService.normalize("   "));
+    void testNormalizeNormalString() {
+        assertEquals("test", service.normalize("  test  "));
     }
-
-    @Test
-    void testNormalize_RegularInput() {
-        assertEquals("Hello", paymentReferenceService.normalize(" Hello "));
-    }
-}
+}
\ No newline at end of file