Each time you pay for a subscription you get an invoice per email automatically (as an attachment).
You can also access all your invoices using the subscription portal. Please, note, that it uses a different account than your main InfraNodus account, so you will need a different password to access it.
To Manage Your Subscription and Access Your Invoices:
If you are already logged in, go to the Settings page — https://infranodus.com/settings — and then scroll down to the bottom of the settings page — you will see the subscription management tab and when you click to log in the subscription portal, you will create a one-time password and you'll be able to access your subscription portal and download all your invoices.
If you are logged out, go to the Login page https://infranodus.com/login and at the bottom of the login page you'll see a link to manage your subscription.
You'll need to log in separately (you'll receive a one-time password) and then you'll be able to access your invoices.