This method returns the certificate chain.
List of certificate in hexadecimal format (DER encoded)
["308203C3308202BB02010002818100D1A9F4F7F0E5E8B3A8A6A7B0C7F2F9C8A7B5D3E4E8D4C3D2E1C0B0A0F0E0D0C0B0A0F0E0D0C0B0A0F0E0D0C0B0A0F"]