Step by Step Guide to Building a Shopee API Integration in Java

Introduction

Hey there, fellow developer! Ready to dive into the world of e-commerce integration? Today, we're tackling the Shopee API with Java. This guide will walk you through the process of building a robust integration that'll have you managing products, orders, and inventory like a pro. Let's get cracking!

Prerequisites

Before we jump in, make sure you've got:

• A Java development environment (I know you've got this covered!)
• Shopee API credentials (if you don't have these yet, hop over to the Shopee developer portal)
• Your favorite Java IDE

Setting up the project

First things first, let's get our project set up:

1. Create a new Java project in your IDE
2. If you're using Maven, add this to your pom.xml:

<dependencies>
    <dependency>
        <groupId>com.squareup.okhttp3</groupId>
        <artifactId>okhttp</artifactId>
        <version>4.10.0</version>
    </dependency>
    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <version>2.8.9</version>
    </dependency>
</dependencies>

For Gradle users, add this to your build.gradle:

dependencies {
    implementation 'com.squareup.okhttp3:okhttp:4.10.0'
    implementation 'com.google.code.gson:gson:2.8.9'
}

Authentication

Alright, time to get our hands dirty with some code:

public class ShopeeClient {
    private static final String BASE_URL = "https://partner.shopeemobile.com";
    private final String partnerId;
    private final String partnerKey;

    public ShopeeClient(String partnerId, String partnerKey) {
        this.partnerId = partnerId;
        this.partnerKey = partnerKey;
    }

    private String generateSignature(String endpoint, long timestamp) {
        String toSign = partnerId + "|" + endpoint + "|" + timestamp;
        return HmacSHA256(toSign, partnerKey);
    }

    // Implement HmacSHA256 method here
}

Making API requests

Now, let's create a method to make API calls:

public String makeApiCall(String endpoint, String jsonBody) throws IOException {
    long timestamp = System.currentTimeMillis() / 1000L;
    String signature = generateSignature(endpoint, timestamp);

    OkHttpClient client = new OkHttpClient();
    RequestBody body = RequestBody.create(jsonBody, MediaType.get("application/json; charset=utf-8"));
    
    Request request = new Request.Builder()
        .url(BASE_URL + endpoint)
        .addHeader("Content-Type", "application/json")
        .addHeader("Authorization", signature)
        .post(body)
        .build();

    try (Response response = client.newCall(request).execute()) {
        return response.body().string();
    }
}

Implementing core functionalities

Let's implement some key features:

Product management

public String getProductInfo(String productId) throws IOException {
    String endpoint = "/api/v2/product/get_info";
    String jsonBody = "{\"product_id\": \"" + productId + "\"}";
    return makeApiCall(endpoint, jsonBody);
}

Order management

public String getOrders(long startTime, long endTime) throws IOException {
    String endpoint = "/api/v2/order/get_order_list";
    String jsonBody = String.format("{\"time_from\": %d, \"time_to\": %d}", startTime, endTime);
    return makeApiCall(endpoint, jsonBody);
}

Inventory management

public String updateStock(String productId, int stock) throws IOException {
    String endpoint = "/api/v2/product/update_stock";
    String jsonBody = String.format("{\"product_id\": \"%s\", \"stock\": %d}", productId, stock);
    return makeApiCall(endpoint, jsonBody);
}

Error handling and rate limiting

Don't forget to implement retry logic and respect Shopee's rate limits. Here's a simple exponential backoff:

private String makeApiCallWithRetry(String endpoint, String jsonBody, int maxRetries) throws IOException {
    int retries = 0;
    while (true) {
        try {
            return makeApiCall(endpoint, jsonBody);
        } catch (IOException e) {
            if (++retries == maxRetries) throw e;
            try {
                Thread.sleep((long) Math.pow(2, retries) * 1000);
            } catch (InterruptedException ie) {
                Thread.currentThread().interrupt();
                throw new IOException("Interrupted during backoff", ie);
            }
        }
    }
}

Testing the integration

Now's the time to put your creation through its paces. Write some unit tests for your methods and run integration tests using Shopee's sandbox environment. Trust me, your future self will thank you!

Best practices and optimization

To take your integration to the next level:

1. Implement caching for frequently accessed data
2. Use asynchronous operations for non-blocking API calls
3. Batch API requests where possible to reduce network overhead

Conclusion

And there you have it! You've just built a solid foundation for a Shopee API integration in Java. Remember, this is just the beginning – there's a whole world of e-commerce functionality to explore. Keep experimenting, keep coding, and most importantly, have fun with it!

For more details, check out the Shopee Open Platform documentation. Happy coding!