To add company details to your invoice, follow these quick steps:
1. Go to My Account, then click on the Manage Billing button on the left side
2. On the Manage Billing page, under the section "Billing Information" on the right side, click on Update Billing Information
3. Add your company address, tax registration number and any other information you would like to include in your invoice
4. Save your changes, then go back to the My Account page
5. Now, when you click on Payment Receipts and download the Receipt PDF, you should see the details you added in the downloaded receipt