When you set up your seller account, you should have had to specify an automatic payment method to pay your seller fees. You can also pay with a onetime payment. But all sellers are required to have an automatic payment method on file either way. It should have been either your PayPal account, Credit card or direct pay from your checking account.
Your invoice payment then will be automatically processed by your payment due date, according to the payment method you chose when you created your seller account.
The due date is based on your billing cycle date. If your billing date is on the 15th of the month, your payment is due by the 15th of the following month. If your billing date is on the last day of the month, your payment is due by the last day of the following month.
To confirm your payment method on file:
1.Click My eBay at the top of most eBay pages. You may need to sign in.
2.Place your pointer over the Account tab, and then click Seller Account.
3.Scroll down to the section titled Payment methods for Seller Fees to find out your current payment method.