To enable function of coupons auto import follow next path -
Cashback Tracker > Coupons > Coupon Import (it’s enabled by default)
Plugin will use default WP cron to update all coupons in background. You don’t need to have any additional cron settings for this. After activation you can expect some time for full coupon loading.
Cashback Tracker > Advertisers > Coupons to see number of coupons for each merchant and date of last update.