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WAservix · Java

WAservix Java integration

Connect WAservix to your Java app: send WhatsApp messages from your own WhatsApp number, check delivery and receive replies by webhook. Copy the examples, add your key and run.

Requirements

Java 11+ for java.net.http.HttpClient (the webhook helper uses HexFormat, Java 17+). No extra libraries.

Add your API key

Create a key under WAservix → Devices → API key (it starts with wpk_). Keep it on your server, in an environment variable or secret store. Never put it in a website, a mobile app or a public repository.

export WASERVIX_KEY=wpk_your_key
export WASERVIX_WEBHOOK_SECRET=your_webhook_secret

Set up the client

Base URL https://tekservix.com/waservix/api. Send the key as Authorization: Bearer wpk_….

import java.net.URI;
import java.net.http.*;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.time.Duration;
import java.util.HexFormat;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

Send a WhatsApp message

Messages are queued and sent one at a time per number, so the answer comes back at once with "status": "in_progress" and a msgId.

HttpClient client = HttpClient.newHttpClient();
HttpRequest req = HttpRequest.newBuilder(URI.create("https://tekservix.com/waservix/api/send-message"))
    .header("Authorization", "Bearer " + System.getenv("WASERVIX_KEY"))
    .header("Content-Type", "application/json")
    .timeout(Duration.ofSeconds(30))
    .method("POST", HttpRequest.BodyPublishers.ofString("{\"to\": \"+250788123456\", \"text\": \"Hello Aline, your order is ready\"}"))
    .build();
HttpResponse<String> res = client.send(req, HttpResponse.BodyHandlers.ofString());
if (res.statusCode() >= 400) throw new RuntimeException(res.body());
System.out.println(res.body());

Send a document or image

Use imageUrl, videoUrl, audioUrl or documentUrl with a public https link. Groups work too: put the group JID (…@g.us) in to.

HttpClient client = HttpClient.newHttpClient();
HttpRequest req = HttpRequest.newBuilder(URI.create("https://tekservix.com/waservix/api/send-message"))
    .header("Authorization", "Bearer " + System.getenv("WASERVIX_KEY"))
    .header("Content-Type", "application/json")
    .timeout(Duration.ofSeconds(30))
    .method("POST", HttpRequest.BodyPublishers.ofString("{\"to\": \"+250788123456\", \"text\": \"Your invoice\", \"documentUrl\": \"https://example.com/inv-1042.pdf\", \"fileName\": \"Invoice-1042.pdf\"}"))
    .build();
HttpResponse<String> res = client.send(req, HttpResponse.BodyHandlers.ofString());
if (res.statusCode() >= 400) throw new RuntimeException(res.body());
System.out.println(res.body());

Check message status

status is queued, sent, delivered, read, played or failed. Webhooks tell you without polling.

HttpClient client = HttpClient.newHttpClient();
HttpRequest req = HttpRequest.newBuilder(URI.create("https://tekservix.com/waservix/api/messages/58213/info"))
    .header("Authorization", "Bearer " + System.getenv("WASERVIX_KEY"))
    .timeout(Duration.ofSeconds(30))
    .method("GET", HttpRequest.BodyPublishers.noBody())
    .build();
HttpResponse<String> res = client.send(req, HttpResponse.BodyHandlers.ofString());
if (res.statusCode() >= 400) throw new RuntimeException(res.body());
System.out.println(res.body());

Receive WhatsApp messages by webhook

Set a webhook URL and events for the number under WAservix → Devices. Each request carries X-Webhook-Signature, which equals that device’s webhook secret. Compare it in constant time, answer 2xx quickly and process the message after answering (we retry 3 times).

// The X-Webhook-Signature header carries your device's webhook secret.
static boolean verify(String header) {
    String secret = System.getenv("WASERVIX_WEBHOOK_SECRET");
    return header != null && MessageDigest.isEqual(secret.getBytes(StandardCharsets.UTF_8), header.getBytes(StandardCharsets.UTF_8));
}

Errors, limits and retries

Every answer has success; errors add a readable message. 401 means a wrong key, 402 no active plan for this number or phone, 409 the number or phone isn’t connected, 429 too many requests (300 a minute per key): wait for the Retry-After seconds and try again. Retry 5xx and network errors with a back-off, but don’t blindly retry a send that may have worked: check its status first, or you could send twice.

Full list of endpoints and fields: WAservix API reference.

Questions

Is this the official WhatsApp Business API?

No. WAservix links your own number as a companion device, like WhatsApp Web, so there is no Meta approval. Only message people who expect to hear from you: WhatsApp can ban numbers that spam.

Can I call the API from a mobile app or browser?

Don’t. Anyone could read the key from the app or page. Call the API from your server and let your app talk to your server.

Other languages

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