Java

// UpayClient.java
import com.fasterxml.jackson.databind.ObjectMapper;

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpRequest.BodyPublishers;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandlers;
import java.util.Map;

public class UpayClient {

    private static final String BASE_URL = "https://upay-sistema-api.onrender.com/api/v1";

    private final HttpClient http = HttpClient.newHttpClient();
    private final ObjectMapper mapper = new ObjectMapper();
    private final String apiKey;

    public UpayClient(String apiKey) {
        this.apiKey = apiKey;
    }

    // ─── HTTP helpers ────────────────────────────────────────────────────────

    private Map<String, Object> get(String path) throws Exception {
        var req = HttpRequest.newBuilder()
                .uri(URI.create(BASE_URL + path))
                .header("Authorization", "Bearer " + apiKey)
                .GET()
                .build();
        return send(req);
    }

    private Map<String, Object> post(String path, Object body) throws Exception {
        var json = mapper.writeValueAsString(body);
        var req  = HttpRequest.newBuilder()
                .uri(URI.create(BASE_URL + path))
                .header("Authorization", "Bearer " + apiKey)
                .header("Content-Type", "application/json")
                .POST(BodyPublishers.ofString(json))
                .build();
        return send(req);
    }

    @SuppressWarnings("unchecked")
    private Map<String, Object> send(HttpRequest req) throws Exception {
        HttpResponse<String> res = http.send(req, BodyHandlers.ofString());
        Map<String, Object> data = mapper.readValue(res.body(), Map.class);
        if (res.statusCode() >= 400) {
            throw new RuntimeException((String) data.getOrDefault("message", "HTTP " + res.statusCode()));
        }
        return data;
    }

    // ─── Transações ──────────────────────────────────────────────────────────

    public Map<String, Object> createTransaction(
            String product,
            int    amountCents,
            String clientName,
            String clientEmail,
            String clientDocument,
            String paymentMethod
    ) throws Exception {
        return post("/transactions", Map.of(
            "product",        product,
            "amountCents",    amountCents,
            "clientName",     clientName,
            "clientEmail",    clientEmail,
            "clientDocument", clientDocument,
            "paymentMethod",  paymentMethod
        ));
    }

    public Map<String, Object> listTransactions(int page, int limit) throws Exception {
        return get("/transactions?page=" + page + "&limit=" + limit);
    }

    public Map<String, Object> getTransaction(String id) throws Exception {
        return get("/transactions/" + id);
    }

    // ─── Links de pagamento ──────────────────────────────────────────────────

    public Map<String, Object> createPaymentLink(String title, int amountCents) throws Exception {
        return post("/payment-links", Map.of("title", title, "amountCents", amountCents));
    }

    public Map<String, Object> listPaymentLinks(int page, int limit) throws Exception {
        return get("/payment-links?page=" + page + "&limit=" + limit);
    }

    public Map<String, Object> getPaymentLink(String id) throws Exception {
        return get("/payment-links/" + id);
    }

    // ─── Produtos ────────────────────────────────────────────────────────────

    public Map<String, Object> createProduct(String name, int priceCents) throws Exception {
        return post("/products", Map.of("name", name, "priceCents", priceCents));
    }

    public Map<String, Object> listProducts(int page, int limit) throws Exception {
        return get("/products?page=" + page + "&limit=" + limit);
    }
}

import java.util.Map;

public class Main {
    public static void main(String[] args) throws Exception {
        var upay = new UpayClient(System.getenv("UPAY_API_KEY"));

        // Criar transação PIX
        var tx = upay.createTransaction(
            "Curso Java",
            19900,
            "João Silva",
            "joao@example.com",
            "12345678900",
            "PIX"
        );
        var data = (Map<?, ?>) tx.get("data");
        System.out.println("PIX copia-e-cola: " + data.get("pixCopiaECola"));

        // Listar transações
        var result = upay.listTransactions(1, 20);
        var list   = (java.util.List<?>) result.get("data");
        System.out.println(list.size() + " transações encontradas");

        // Criar link de pagamento
        var link     = upay.createPaymentLink("Produto Premium", 9900);
        var linkData = (Map<?, ?>) link.get("data");
        System.out.println("Checkout: " + linkData.get("url"));
    }
}

try {
    var tx = upay.createTransaction(
        "Pedido #001", 50,  // abaixo do mínimo
        "João", "joao@example.com", "12345678900", "PIX"
    );
} catch (RuntimeException e) {
    System.out.println("Erro: " + e.getMessage());
}

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.util.HexFormat;

public class WebhookValidator {

    public static boolean isValid(byte[] body, String signature, String secret) throws Exception {
        Mac mac = Mac.getInstance("HmacSHA256");
        mac.init(new SecretKeySpec(secret.getBytes(), "HmacSHA256"));
        String expected = "sha256=" + HexFormat.of().formatHex(mac.doFinal(body));
        return expected.equals(signature);
    }
}

@PostMapping("/webhook")
public ResponseEntity<?> webhook(
        @RequestBody byte[] body,
        @RequestHeader("x-webhook-signature") String signature
) throws Exception {
    if (!WebhookValidator.isValid(body, signature, webhookSecret)) {
        return ResponseEntity.status(401).body(Map.of("error", "Assinatura inválida"));
    }

    Map<?, ?> event = objectMapper.readValue(body, Map.class);
    System.out.println("Evento recebido: " + event.get("event"));
    return ResponseEntity.ok(Map.of("received", true));
}