Here's how to invoice a single appointment straight from the appointment. The invoice is filled in for you, so there's no wizard to go through.
Invoice an appointment
Tap Appts and open the appointment.
Tap ... at the top right.
Choose Create invoice. The invoice is filled in from the appointment.
Check it, and tap the ✓ to save. Walkies sends it to your client.
What's filled in
The client, and their pets on the appointment.
The service and add-ons, dated the day of the appointment. A stay is billed for every day it covers.
Travel, tip, discount and any surcharges on the appointment.
The payment method: the appointment's, then the client's preferred, then your company's.
The due date: the appointment's, or the day of the appointment plus your due date offset (7 days if you haven't set one).
The deposit, if the appointment has one.
You can change anything on the invoice before you save it.
Good to know
Only the visit you opened is invoiced, even if it's part of a repeating series.
The invoice is linked to the appointment. When you next open it, the ... menu shows View invoice instead, and starting an appointment set to When started won't bill it again.
On a group appointment, this only invoices the first client.
It's hidden for Busy and Holiday time, and for prepaid requests.
Only admins and sub-admins can create invoices.
To have invoices made for you, set the appointment to invoice When booked or When started. See Which way of invoicing should I use?