public String decryptToStringApiV2(byte[] associatedData, byte[] nonce, String ciphertext) throws GeneralSecurityException { try { Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding"); SecretKeySpec key = new SecretKeySpec(this.aesKey, "AES"); GCMParameterSpec spec = new GCMParameterSpec(128, nonce); cipher.init(2, key, spec); cipher.updateAAD(associatedData); return new String(cipher.doFinal(Base64.getDecoder().decode(ciphertext)), StandardCharsets.UTF_8); } catch (NoSuchPaddingException | NoSuchAlgorithmException var7) { GeneralSecurityException e = var7; throw new IllegalStateException(e); } catch (InvalidAlgorithmParameterException | InvalidKeyException var8) { GeneralSecurityException e = var8; throw new IllegalArgumentException(e); } } new RSAPublicKeyConfig.Builder() .merchantId(payConfig.getMerchantId()) .privateKeyFromPath(keyPath) .publicKeyFromPath(publicKeyPath) .publicKeyId(payConfig.getPublicKeyId()) .merchantSerialNumber(payConfig.getMerchantSerialNumber()) .apiV3Key(payConfig.getApiV3Key()) .build();