The MailerLite Refer a friend program allows you to send your friends a $20 credit for MailerLite and if they sign up, you get $20 credit too!
Credit is automatically applied to your referrals account when they sign up and automatically applied to your account when your friend upgrades to a paid plan.
You can find your credit on your Refer a friend dashboard, which you can find at the bottom of the sidebar, just right below Settings.

This credit can be used towards your MailerLite plan or upgrade.
If you referred a friend and have not received any credit, it is likely due to one of the following reasons:
Your friend has not yet purchased a plan
Your friend did not sign up via your specific link
Your friend signed up over 30 days after the invite was sent