Here's how you can refund full or partial amount through PodiumIO -
Step by step process -
Step 1. Go to "Payments" in the right menu bar. Choose "Payments".

Step 2. Choose the customer whom you would like to Refund

Step 3. Enter the amount that you would like to refund. Click "Issue Refund"

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?