Hi, I need help integrating Opayo payment gateway (simple form version) with a classic asp website. Will involve encoding and decoding (AES 128-bit CBC mode PKCS#5 - encoded as hex) and, posting form, decrypting results and redirecting accordingly. Expecting encryption to be done in C# as I have no access to install server components…. I have a more detailed brief if anyone can help. Need ASAP. Thanks!