Hi @LMB !
If you purchased your Docusign account plan through our Docusign website, you can view and download your Docusign invoices by accessing your eSignature Settings > Plan and Billing menu. Please, check this article to get more information: Download an Invoice
For future invoices, you can add your tax identification/vat receipt in Address Line 2. Please access eSignature Settings > Account Profile > Account Address. Check this article for more information: Update Your Account Name and Address
For invoices already created, I’m not sure if Docusign can edit them. My recommendation is to open a case with Docusign Customer Support and ask them if is this possible. To open a case, please follow these steps: Open a case in the Docusign Support Center
I hope I could clarify your question!