How you refund will be based on what processor was used for the sale.
For credit card processors (Stripe, Authorize.net, PayPal Payments Pro, etc.) and PayPal Express Checkout you can perform a refund from right inside DPD:
1. Log in to DPD
2. Go to the Purchase list in the left menu
3. Find the purchase and click on it’s ID to open the purchase details page
4. Scroll down to the “Transaction History” portion of the page and click the refund
For PayPal Standard, 2CO, and other methods that do not support refunds through their API:
You will need to perform the refund at the processor (by logging in to PayPal, 2CO, etc.). DPD will capture the refund notification from the processor and mark the purchase as refunded in our system.
This is a limitation of these processors and not DPD- they simply don’t support refunds through a 3rd party cart.