Apex domains cannot have CNAME records.
Question and response
Question
dig paytsoftware.com. NS
Answer
paytsoftware.com. 5 NS ns-1675.awsdns-17.co.uk.
paytsoftware.com. 5 NS ns-1526.awsdns-62.org.
paytsoftware.com. 5 NS ns-438.awsdns-54.com.
paytsoftware.com. 5 NS ns-774.awsdns-32.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0