Netregistry can not provide invoices in advance of a domain registration and/or renewals. This is due to the agreement we have with the regulatory bodies associated with TLD registries. An invoice will be produced after the domain has been renewed and/or registered with payment taken.
There are specific instructions in the renewal notifications sent to you regarding how to pay for your domain renewal. Once a domain name renewal fee is paid, you will receive an invoice. For yearly service renewals however, invoices can be produced prior to payment but this cannot be done for Domain name renewals. This is to ensure the domain name/s do not get dropped.
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To make a payment please follow support article "How to Make a Payment"