Add functionality for Shopify exchanges

[danny10]

Please add in support for the new Shopify Exchanges feature.

https://help.shopify.com/en/manual/orders/refunds-returns/exchanges

We have been waiting for Shopify to release this for ages and now find it is not compatible with Shipstation - super disappointing.

[DND4Life]

I have an option but its 3rd party, not sure if shipstation is gonna offer native support.