Merge pull request 'BAIS payments 멀티모듈 최소 구현' (#3) from forge/BAIS-CTX-1783821073-attempt-4 into main

.forge/BAIS-CTX-1783821073-attempt-4.md

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+# BAIS-CTX-1783821073-attempt-4
+
+Forge 이슈 작업 브랜치 `forge/BAIS-CTX-1783821073-attempt-4`.

pom.xml

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+<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>

services/payments/pom.xml

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+<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>
+            <groupId>org.apache.commons</groupId>
+            <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>

services/payments/src/main/java/com/klaro/bais/payments/PaymentReferenceService.java

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+package com.klaro.bais.payments;
+
+import org.apache.commons.lang3.StringUtils;
+
+public class PaymentReferenceService {
+    public String normalize(String input) {
+        return StringUtils.trimToEmpty(input);
+    }
+}

services/payments/src/test/java/com/klaro/bais/payments/PaymentReferenceServiceTest.java

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+package com.klaro.bais.payments;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class PaymentReferenceServiceTest {
+
+    private final PaymentReferenceService service = new PaymentReferenceService();
+
+    @Test
+    void testNormalizeNull() {
+        assertEquals("", service.normalize(null));
+    }
+
+    @Test
+    void testNormalizeEmpty() {
+        assertEquals("", service.normalize("  "));
+    }
+
+    @Test
+    void testNormalizeNormalString() {
+        assertEquals("test", service.normalize("  test  "));
+    }
+}