This is the SiD Secure EFT plugin for Prestashop 8.1.7 Please feel free to contact the Payfast support team should you require any assistance.
Please navigate to the releases page, download the latest release (v1.1.0) and unzip. You will then be able to follow the integration guide which is included in the zip.
Please submit pull requests with any tweaks, features or fixes you would like to share.