diff --git a/.forge/BAIS-NATIVE-1783698057-attempt-1.md b/.forge/BAIS-NATIVE-1783698057-attempt-1.md
new file mode 100644
index 0000000..ff1dd68
--- /dev/null
+++ b/.forge/BAIS-NATIVE-1783698057-attempt-1.md
@@ -0,0 +1,3 @@
+# BAIS-NATIVE-1783698057-attempt-1
+
+Forge 이슈 작업 브랜치 `forge/BAIS-NATIVE-1783698057-attempt-1`.
diff --git a/.forge/BAIS-SOURCE-1783702539-attempt-1.md b/.forge/BAIS-SOURCE-1783702539-attempt-1.md
new file mode 100644
index 0000000..b15de76
--- /dev/null
+++ b/.forge/BAIS-SOURCE-1783702539-attempt-1.md
@@ -0,0 +1,3 @@
+# BAIS-SOURCE-1783702539-attempt-1
+
+Forge 이슈 작업 브랜치 `forge/BAIS-SOURCE-1783702539-attempt-1`.
diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
index b7d7378..6622513 100644
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@@ -1,5 +1,5 @@
 name: ci
-on: [push, pull_request]
+on: [pull_request]
 jobs:
   test:
     runs-on: ubuntu-latest
diff --git a/pom.xml b/pom.xml
new file mode 100644
index 0000000..38f992a
--- /dev/null
+++ b/pom.xml
@@ -0,0 +1,40 @@
+<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>
+    <groupId>com.example</groupId>
+    <artifactId>bais-gate-e2e</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>3.2.0</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+
+    <properties>
+        <java.version>17</java.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/src/main/java/com/example/baisgate/BaisGateApplication.java b/src/main/java/com/example/baisgate/BaisGateApplication.java
new file mode 100644
index 0000000..451a245
--- /dev/null
+++ b/src/main/java/com/example/baisgate/BaisGateApplication.java
@@ -0,0 +1,11 @@
+package com.example.baisgate;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class BaisGateApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(BaisGateApplication.class, args);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/baisgate/PaymentService.java b/src/main/java/com/example/baisgate/PaymentService.java
new file mode 100644
index 0000000..489d52a
--- /dev/null
+++ b/src/main/java/com/example/baisgate/PaymentService.java
@@ -0,0 +1,10 @@
+package com.example.baisgate;
+
+public class PaymentService {
+    public String approve(String transactionId) {
+        if (transactionId == null || transactionId.trim().isEmpty()) {
+            throw new IllegalArgumentException("Transaction ID cannot be blank");
+        }
+        return "APPROVED:" + transactionId;
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/com/example/baisgate/BaisGateApplicationTests.java b/src/test/java/com/example/baisgate/BaisGateApplicationTests.java
new file mode 100644
index 0000000..1a8f4c5
--- /dev/null
+++ b/src/test/java/com/example/baisgate/BaisGateApplicationTests.java
@@ -0,0 +1,12 @@
+package com.example.baisgate;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class BaisGateApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/com/example/baisgate/PaymentServiceTest.java b/src/test/java/com/example/baisgate/PaymentServiceTest.java
new file mode 100644
index 0000000..1caa7a9
--- /dev/null
+++ b/src/test/java/com/example/baisgate/PaymentServiceTest.java
@@ -0,0 +1,32 @@
+package com.example.baisgate;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+class PaymentServiceTest {
+
+    @Test
+    void testApprove_WithValidTransactionId_ReturnsApproved() {
+        PaymentService paymentService = new PaymentService();
+        String result = paymentService.approve("12345");
+        assertEquals("APPROVED:12345", result);
+    }
+
+    @Test
+    void testApprove_WithBlankTransactionId_ThrowsIllegalArgumentException() {
+        PaymentService paymentService = new PaymentService();
+        Exception exception = assertThrows(IllegalArgumentException.class, () -> {
+            paymentService.approve("");
+        });
+        assertEquals("Transaction ID cannot be blank", exception.getMessage());
+    }
+
+    @Test
+    void testApprove_WithNullTransactionId_ThrowsIllegalArgumentException() {
+        PaymentService paymentService = new PaymentService();
+        Exception exception = assertThrows(IllegalArgumentException.class, () -> {
+            paymentService.approve(null);
+        });
+        assertEquals("Transaction ID cannot be blank", exception.getMessage());
+    }
+}
\ No newline at end of file