Step 1: Click on Settings from the Admin left panel.
Step 2: From the options that pop up, select Subscriptions.
Step 3: From Subscriptions, click on Payment Invoices. This will let you see all the payment invoices you have.
If you wish to see the invoice of a particular month or year, select the particular date/ year in the blank as given in the screenshot below and click on Go.
You can also download invoices by clicking on the download button.