Estou obtendo o seguinte erro ao usar o SDK:
GuzzleHttp\Exception\ConnectException {#2094 // app\Http\Controllers\Api\Checkout\PaymentController.php:100
#message: "cURL error 52: Empty reply from server (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://pix-h.api.efipay.com.br/oauth/token"