https://gst.caknowledge.in/igst-integrated-goods-services-tax/
http://gst.gov.in
https://www.cleartax.in
https://www.indiafilings.com/learn/sac-code-gst-rate-it-services/
SAC Code 998434 – Software downloads
SAC Code 998439 – Other on-line contents
https://www.gstindia.com/taxability-of-software-under-present-indirect-tax-laws-proposed-gst-with-examples-in-india/
https://gstindiaguide.com/tag/tax-invoice-generator/
howtoexportimport.com/How-to-prepare-GST-tax-Invoice--4863.aspx
http://community.tallysolutions.com/custom_news/exports-under-gst/