What kind of integrations have you done? Can you give an example?

In my integration experience, I often worked with REST APIs of external services for data exchange between systems. For example, integration with a payment gateway, where it was necessary to send requests to create payments and handle responses with transaction results.

An example of integration in Java using HttpClient:

HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
    .uri(URI.create("https://api.paymentgateway.com/payments"))
    .header("Content-Type", "application/json")
    .POST(HttpRequest.BodyPublishers.ofString(jsonPayload))
    .build();

HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
if (response.statusCode() == 200) {
    // handle successful response
}

I also integrated with queue systems (for example, RabbitMQ) for asynchronous message exchange between microservices.