# System Requirements

#### Installed Feature and PTF Requirements
* To perform the authentication required by CyberSource, CyberSource Toolkit for i relies on OpenSSL, part of the **IBM Portable Utilities for i** licensed program offering (LPO) 5733-SC1.
* **IBM i 7.5**: You should have PTF **[SI84261](https://www.ibm.com/mysupport/s/fix-information/aDr3p000000gJIuCAM/fi0070689?language=en_US)** or a superseding PTF installed to ensure a modern version of OpenSSL is installed.
* **IBM i 7.3/7.4**: You should have PTF **[SI84245](https://www.ibm.com/mysupport/s/fix-information/aDr3p000000gJVGCA2/fi0071003?language=en_US)** or a superseding PTF installed to ensure a modern version of OpenSSL is installed.

#### Operating System Level Support
CyberSource Toolkit for i can be installed on the following operating system versions:

* IBM i OS 7.6
* IBM i OS 7.5
* IBM i OS 7.4
* IBM i OS 7.3