GST chargability - Additional place of business

I have regarding gst charged on following activity

I have registered taxpayer in Karnataka and I sell books through online e commerce and have additional place of business in Delhi and other parts of India in e commerce warehouse.

I take contract from Delhi taxpayer for publication of books he charges GST and delivery books to Delhi warehouse

Now Delhi taxpayer shall raise IGST Invoice or CGST+SGST Invoice for above business activities?