This plugin integrates Affiliates with eShop.
The recommended setting for the Default referral status in Affiliates > Options is Pending. You should manually accept pending referrals after their orders have been paid.
Note that you can install the plugins from your WordPress installation directly: use the Add new option found in the Plugins menu.
You can also upload and extract them in your site's
/wp-content/plugins/ directory or use the Upload option.