Under Organizer → Billing you configure everything needed to issue invoices.
Organizer information
The tax details that will appear on invoices: company name, tax ID and full fiscal address (with its two address lines).
Invoice series
Invoices are numbered within series. Create series to organize your invoicing by year or type:
Click Create New Invoice Series
Enter the series name (e.g. "Series 2025"), the starting number and an optional description
Click Create Series
Select the active series that new invoices will use
You need at least one invoice series to issue invoices (also for co-organizers).
Tax settings
Define the taxes that apply to your invoicing (VAT applied to registrations).
Invoice format
Customize how invoices look:
Invoice logo (JPG or PNG, max 2 MB)
Footer text: appears at the bottom of every invoice (registry details, terms, etc.)
Relation to events
Each event also has its own billing configuration under the event's Settings → Billing, where you choose that event's series and taxes. See Billing configuration.