diff --git a/.forge/BAIS-CTX-1783821073-attempt-4.md b/.forge/BAIS-CTX-1783821073-attempt-1.md
similarity index 63%
rename from .forge/BAIS-CTX-1783821073-attempt-4.md
rename to .forge/BAIS-CTX-1783821073-attempt-1.md
index 27c880c..fa332cd 100644
--- a/.forge/BAIS-CTX-1783821073-attempt-4.md
+++ b/.forge/BAIS-CTX-1783821073-attempt-1.md
@@ -1,3 +1,3 @@
-# BAIS-CTX-1783821073-attempt-4
+# BAIS-CTX-1783821073-attempt-1
 
-Forge 이슈 작업 브랜치 `forge/BAIS-CTX-1783821073-attempt-4`.
+Forge 이슈 작업 브랜치 `forge/BAIS-CTX-1783821073-attempt-1`.
diff --git a/pom.xml b/pom.xml
index d025c7b..3a06184 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,22 +1,15 @@
-<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>
\ No newline at end of file
+</project>
diff --git a/services/payments/pom.xml b/services/payments/pom.xml
index f4d20af..0bddfb9 100644
--- a/services/payments/pom.xml
+++ b/services/payments/pom.xml
@@ -1,16 +1,11 @@
-<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>
@@ -18,12 +13,5 @@
             <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>
\ No newline at end of file
+</project>
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 a349b69..159a78d 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 b363d79..ee30f15 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
@@ -1,24 +1,28 @@
 package com.klaro.bais.payments;
 
 import org.junit.jupiter.api.Test;
-import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.*;
 
 class PaymentReferenceServiceTest {
-
-    private final PaymentReferenceService service = new PaymentReferenceService();
+    private final PaymentReferenceService paymentReferenceService = new PaymentReferenceService();
 
     @Test
-    void testNormalizeNull() {
-        assertEquals("", service.normalize(null));
+    void testNormalize_NullInput() {
+        assertEquals("", paymentReferenceService.normalize(null));
     }
 
     @Test
-    void testNormalizeEmpty() {
-        assertEquals("", service.normalize("  "));
+    void testNormalize_EmptyInput() {
+        assertEquals("", paymentReferenceService.normalize(""));
     }
 
     @Test
-    void testNormalizeNormalString() {
-        assertEquals("test", service.normalize("  test  "));
+    void testNormalize_WhitespaceInput() {
+        assertEquals("", paymentReferenceService.normalize("   "));
     }
-}
\ No newline at end of file
+
+    @Test
+    void testNormalize_RegularInput() {
+        assertEquals("Hello", paymentReferenceService.normalize(" Hello "));
+    }
+}