Map "CustomerReference" field from DEAR systems integration into "External Order Number" field into Mintsoft.

I have a client that uses both Shopify and DEAR systems. Orders from Shopify are sent to DEAR and these in turn are sent to Mintsoft. When orders transfer from DEAR to Mintsoft, only the DEAR order number is passed over and we lose visibility to the Shopify order number. The shopify order however is mapped into DEAR "CustomerReference" field and this is currently not carried forward to Mintsoft.