Definitions according to Shopify

Refunds

A refund is when you send the full or part payment amount back to a customer who placed an order on your online store.

Returns

A return is when a customer returns an item that they purchased from your online store. You can send return instructions to the customer and provide a return shipping label. After you receive and inspect the returned item, you can issue a refund when applicable.

Reporting on Returns using SyncWith

Currently SyncWith has some limited ability to report on returns. You can see our full list of fields shows we have these fields available:

Field	Description
Returned quantity	The number of ordered items that were returned.
Returns	The value of goods returned by a customer. Returns display as a negative number on the date the return was created.

Reporting on Refunds using SyncWith