The Order Fulfillment App is not meant to be a bridge between two separate stores. For instance, you cannot use it to manage listings on one platform (i.e., Shopify) and expect it to update a similar listing on Etsy. There are other apps that specialize in that.
Instead, the Order Fulfillment App is meant to be a dashboard in which to bring over orders from various platforms for fulfillment.
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Order Fulfillment App