To add a billing email, please follow the below instructions :
Step 1. Login to your PodiumIO account and select the customer for whom you wish to add a billing email address.

Step 2. Scroll to the Billing information and add a billing email. Select YES if you want to only Send Invoices to the Billing Email. There is also an option to add a different address for billing than the service address. You also have the option to add a Billing Company Name (this will appear on the Invoice)

Every time an invoice is generated for the customer, the billing email will already be added.

Related articles -
How to generate & send an invoice?
How to add company terms & conditions?
Batch Invoicing: Batch multiple bookings from one customer into a single Invoice
FAQs -
How do I know if an invoice is paid?
How do I update the Billing Address on the Invoice?
Can I send an invoice to multiple people at the same time?
Can I download & print the invoice?