PHP

<?php
// LxsClient.php
 
class LxsClient
{
    private string $baseUrl;
    private string $apiKey;
 
    public function __construct(string $apiKey, string $baseUrl = 'https://api.lxsyscr.com')
    {
        $this->apiKey = $apiKey;
        $this->baseUrl = $baseUrl;
    }
 
    public function emitir(array $data, ?string $idempotencyKey = null): array
    {
        $headers = [
            'X-Api-Key: ' . $this->apiKey,
            'Content-Type: application/json',
            'Idempotency-Key: ' . ($idempotencyKey ?? $this->uuid4())
        ];
        return $this->request('POST', '/api/v1/facturas', $headers, $data);
    }
 
    public function consultar(string $clave): array
    {
        return $this->request('GET', "/api/v1/facturas/$clave", ['X-Api-Key: ' . $this->apiKey]);
    }
 
    public function descargarPdf(string $clave): string
    {
        $ch = curl_init("{$this->baseUrl}/api/v1/facturas/$clave/pdf");
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_HTTPHEADER => ['X-Api-Key: ' . $this->apiKey],
            CURLOPT_TIMEOUT => 30
        ]);
        return curl_exec($ch);
    }
 
    private function request(string $method, string $path, array $headers, ?array $body = null): array
    {
        $ch = curl_init($this->baseUrl . $path);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_CUSTOMREQUEST => $method,
            CURLOPT_HTTPHEADER => $headers,
            CURLOPT_TIMEOUT => 30
        ]);
        if ($body) curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($body));
 
        $response = curl_exec($ch);
        $status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($status >= 400) throw new Exception("HTTP $status: $response");
        return json_decode($response, true);
    }
 
    private function uuid4(): string
    {
        return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
            mt_rand(0, 0xffff), mt_rand(0, 0xffff),
            mt_rand(0, 0xffff),
            mt_rand(0, 0x0fff) | 0x4000,
            mt_rand(0, 0x3fff) | 0x8000,
            mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
        );
    }
}
 
// Uso:
$lxs = new LxsClient(getenv('LXS_API_KEY'));
 
$factura = $lxs->emitir([
    'tipo' => 'FacturaElectronica',
    'cliente' => ['idCliente' => 42],
    'condicionVenta' => '01',
    'medioPago' => '01',
    'moneda' => 'CRC',
    'lineas' => [['idProducto' => 100, 'cantidad' => 2]]
]);
 
echo "Clave: " . $factura['clave'];