PayGol is an online payment service provider offering a wide variety of both worldwide and local payment methods.
You'll need a working WordPress installation using the WooCommerce plugin (tested on versions 2.3.0 up to 2.6.7).
Go to "Plugins -> Add new", search for the PayGol plugin in the WordPress Plugin Directory then click "Install now". You can also click "Upload plugin" to manually upload the plugins' zip file, after which it will be installed automatically. If for any reason this fails, you can also manually extract the plugin's folder into wp-content/plugins/.
In your WordPress plugins panel, activate the PayGol plugin.
Go to the checkout configuration and proceed to configure the plugin: