Do you want to have your Students/Trials provided with an invoice after each automatic payment? If so please follow the step below to turn that option on in your account:
Go to your left side menu, and click on 'Settings' tab and on the options provided select the 'Memberships' option like such
From the Membership tab, click on Invoices and Receipts:
Scroll down the page until you find the section called "Send Automatic Receipts For autoCharge?" and turn this option on:
That's it! Once that option is on turned on, those emails will begin to automatically send out to your autoCharge members every time an automatic payment is processed.