I am attempting to work on some integration with Shopify and Shippo, part of the process is sending an email to our warehouse including the order line items with the Shipping Label attached as a PDF.
When we create the label in Shippo, the fulfillment information is updated in Shopify correctly, but I was wondering if there was any way to link the two back up reliably from an API perspective since the Shippo API appears to not include any invoice information. I see a link to an internal order object, but the API docs don't seem to stipulate any further information and the Shopify Fulfillment record does not appear to include any Shippo object id.
The only thing I see if the Shippo Order Metadata field which includes the order number, so I suppose I could parse this and make the request to Shopify's API but I would prefer a more concrete link if one is available.