Can a customer purchase a free trial more than once?

Issue

Setting up in-channel product with free trial

Limit customers to one free trial

Environment

SDK channel

Roku Billing

SVOD

Answer

The free trial is controlled on your end, so you can control the user to not cheat the Free trial options. 
You will have to recored the userID that was used for the Free trial, so that when they try to subscribe, it only shows the subscription options, and not the Free Trial version.

Additional Resources

Example: a customer bought a monthly subscription and received a 
7-day free trial. After this trial ends, the first payment occurs, if 
the customer did not unsubscribe from the subscription. Question: how 
long the customer will use his monthly subscription between first and 
second payment? 

A: A whole Month