Stripe Payment Integration with WHMCS

I have a reseller WHMCS website fully setup with SSL etc. I need to integrate Stripe Payments. A free module is available and just needs to be installed. [login to view URL] I need a recurring billion option setup that gives the first 7 days free and then charges automatically after 7 days. The current default in WHMCS does not seem to allow this configuration, unless I am missing something. The current option allows for free accounts, and we can set the free account to expire after 7 days, but I don't see any option for a $10/month account to automatically bill after 7 days free. Stripe allows this, but I don't see the option in WHMCS.