Currently the MyDeal.com.au sales channel only supports full refunds on orders. Partial refunds are not synced and must be submitted via the MyDeal Seller Portal.
If you need to cancel or refund an order for the full amount:
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).
If you need to process a partial refund:
For example, because you are only able to fulfil partial quantity of an order or you need to provide compensation for some minor damage, then you must login to the MyDeal Seller Portal to issue the refund (click here for instructions).
If you try to process a partial refund via the Shopify portal then you will receive an email from MyDeal notifying you that the refund request failed and that you must proceed to the MyDeal Seller Portal to submit the refund.