reto tecnico yape

.gitignore

@@ -102,3 +102,6 @@ dist
 
 # TernJS port file
 .tern-port
+
+# Neo4J initial
+neo4j

README.md

@@ -80,3 +80,57 @@ You can use Graphql;
 When you finish your challenge, after forking a repository, you **must** open a pull request to our repository. There are no limitations to the implementation, you can follow the programming paradigm, modularization, and style that you feel is the most appropriate solution.
 
 If you have any questions, please let us know.
+
+# Solution
+For this scenario I created two reactive microservices transaction-service and anti-fraud-service , two Apache Kafka Topics (transactions, fraud-results) to communicate each other and Neo4J graph db to store transactions.
+
+## Stack
+- Java 25
+- Maven 3.5.10
+- Zookeeper
+- Apache Kafka
+- Neo4J
+
+## Instructions to run the solution
+You just run the following docker command line, it download and create images and then run docker instances for zookeeper, apache kafka, neo4j, transaction-service, anti-fraud-service.
+
+```sh
+docker-compose up -d
+```
+
+## Functionality
+### 1. Call transaction endpoint creation
+To test the flow we can call the following endpoint in order to create the transaction, you can call multiple times with differen values minor or major than 1000, this endpoint register the transaction in the neo4j database and sent the evento to the transaction topic.
+
+```curl
+curl --location 'http://localhost:8080/api/v1/transactions' \
+--header 'Content-Type: application/json' \
+--data '{
+    "accountExternalIdDebit":"ACCT_DEBT_999_1",
+    "accountExternalIdCredit":"ACCT_CRED_999_1",
+    "transferTypeId":1,
+    "value": 1100
+}'
+```
+
+
+### 2. Fraud evaluation
+- The anti-fraud-service listen the events from the transaction topic.
+- Evaluate the amount
+- Send the new status (ACCEPTED, REJECTED) to the fraud-results topic
+- The transaction-service listen the events and update the status.
+
+### 3. Verify creation and updating status
+You have two ways to verify the transaction status: by endoint and by neo4j console
+- By endpoint: you can use the following endpoint (replace the transactionId)
+```curl
+curl --location 'http://localhost:8080/api/v1/transactions/fb2e5b98-6414-421f-9eff-349806889d18'
+```
+- By neo4j console: you can go the following and run the query.
+```url
+http://localhost:7474/browser/
+```
+
+```sh
+MATCH (n:Account) RETURN n LIMIT 25
+```

anti-fraud-service/.gitattributes

@@ -0,0 +1,2 @@
+/mvnw text eol=lf
+*.cmd text eol=crlf

anti-fraud-service/.gitignore

@@ -0,0 +1,33 @@
+HELP.md
+target/
+.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

anti-fraud-service/.mvn/wrapper/maven-wrapper.properties

@@ -0,0 +1,3 @@
+wrapperVersion=3.3.4
+distributionType=only-script
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.12/apache-maven-3.9.12-bin.zip

anti-fraud-service/Dockerfile

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+# ── Stage 1: Build ────────────────────────────────────────────────────────────
+FROM eclipse-temurin:25-jdk-alpine AS builder
+
+WORKDIR /app
+
+COPY pom.xml .
+COPY .mvn/ .mvn/
+COPY mvnw .
+
+RUN chmod +x mvnw && \
+    ./mvnw dependency:go-offline -B
+
+COPY src/ src/
+
+RUN ./mvnw clean package -DskipTests -B && \
+    mkdir -p target/extracted && \
+    java -Djarmode=layertools -jar target/*.jar extract --destination target/extracted
+
+# ── Stage 2: Runtime ──────────────────────────────────────────────────────────
+FROM eclipse-temurin:25-jre-alpine AS runtime
+
+RUN addgroup -S appgroup && adduser -S appuser -G appgroup
+
+WORKDIR /app
+
+COPY --from=builder --chown=appuser:appgroup /app/target/extracted/dependencies/ ./
+COPY --from=builder --chown=appuser:appgroup /app/target/extracted/spring-boot-loader/ ./
+COPY --from=builder --chown=appuser:appgroup /app/target/extracted/snapshot-dependencies/ ./
+COPY --from=builder --chown=appuser:appgroup /app/target/extracted/application/ ./
+
+USER appuser
+
+# Solo puerto interno de Actuator (no expone REST hacia afuera)
+EXPOSE 8081
+
+ENV JAVA_OPTS="-XX:+UseContainerSupport \
+               -XX:MaxRAMPercentage=75.0 \
+               -XX:+UseZGC \
+               -Djava.security.egd=file:/dev/./urandom \
+               -Dspring.profiles.active=docker"
+
+ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS org.springframework.boot.loader.launch.JarLauncher"]