In your "my Angelcam" menu, under the "billing" section
​In this section, you can see and download all your past invoices, see your subscriptions and you are even able to edit your billing info in case your credit card expires for example

Directly in our payment gateway
​When your subscription is about to expire, or whenever you're about to get billed, we will send you an email with a link to a payment gateway page where you can update your billing info

Each app you are using has subscription info
​All of our apps include the subscription info, allow you to enable or disable auto-renew, and allow you to change the plan on the fly