You can find the unpaid subcription from the dashboard, It indicates that when the payment is pending from the customer then it comes under the unpaid subscription.
You can see the payment pending in the Subscription list as shown below:
You can find the Unpaid Subscription in the Dashboard as shown below:
If you click on the Unpaid Subscription then it redirects you to a new page as shown below:
Now to bring the customer to notice that he has the pending and to make the payment again, Click on the BOOK button.
This is the redirected page after clicking on the Book button as shown below:
Then after clicking on the yes,book then the transaction gets charged and when the payment gets successful then the payment shows successful in the subscribtion list as shown below:
Then the Unpaid Subscription shows no amount pending indicating the payment was sucessful and no dues are stated as shown below:
Then for the verification that the payment was sucessful look in for the payouts module from the menu to find that the transaction was successful as shown below:
You can click on the link for a video tutorial: