You need to replace <API_KEY> with the API Key that you received from IFS Italy.
IFS Italy - source settings
Data mapping
Format: JSON
Order (JSONPath): $.orders
Order Number (JSONPath): $.reference
Shipments (Ignore)
Tracking Number: $.tracking_code
Tracking Company (Fixed): IFS
Tracking URL (JSONPath): $.tracking_url
Items (JSONPath): $.items
SKU (JSONPath): $.sku
Quantity (JSONPath): $.quantity
IFS Italy - data mapping
Filters
Make sure to add a filter "Tracking Number - is not empty". Otherwise the automation would also fulfill orders that haven't been shipped yet, and there would be no tracking numbers.