Sellers can submit full and partial refunds via the MyDeal ShopifyApp.
If you need to cancel or refund an order (full and partial):
For example, because the product is out of stock or damaged on arrival and you are unable to send a replacement, then you can process the refund via Shopify (click here for instructions).
Once submitted MyDeal will automatically process a full refund to the customer and send the customer an email notifying them of the order cancellation or full refund. (NOTE: it can take up to 1 business day for refunds to sync).