As a customer at Strive, you can store either Paypal or Credit Card as an automatic payment method.
You can use the billing page to store your official address that will be associated with your invoices. Below your payment information, you can see all invoices that were generated for your platform account. You can also download each invoice as a PDF file.
Please Note: If you see the following info block, you have not set up your payment details yet.
As long as your account is in trial mode, this is not a problem. Once you decide to move to the production environment, storing payment details will be mandatory.