When you refer a customer to moonmail, a referred sale/conversion will be recorded as pending in your affiliate reports.
On the first of each month, we review all conversions that took place in the previous calendar month. If there are no issues with the accounts (they are paying customers, no compliance issues, etc.) we will issue the commission to you.
Be sure to have your payment details (Valid PayPal email address) added to the panel so we can issue you commissions (read more about that here).