docs: public ApnsServiceBuilder withCert(KeyStore keyStore, String password, String alias)
              throws InvalidSSLConfig {
          assertPasswordNotEmpty(password);
          return withSSLContext(new SSLContextBuilder()
                  .withAlgorithm(KEY_ALGORITHM)
                  .withCertificateKeyStore(keyStore, password, alias)
                  .withDefaultTrustKeyStore()
                  .build());
      }