ended up using this URL
https://cloudflare.com/cdn-cgi/trace
Not sure if this is an error or if OK from log
184439 info : Starting main loop at 2020-06-20 18:44
184439 : Detect local IP on 'web'
184439 : #> /usr/bin/wget-ssl --hsts-file=/tmp/.wget-hsts -nv -t 1 -O /var/run/ddns/Cloudflare.dat -o /var/run/ddns/Cloudflare.err --no-proxy 'https://cloudflare.com/cdn-cgi/trace'
184439 : Local IP '173.75.59.197' detected on web at 'https://cloudflare.com/cdn-cgi/trace'
184439 : Forced Update - L: '173.75.59.197' == R: '173.75.59.197'
184439 : parsing script '/usr/lib/ddns/update_cloudflare_com_v4.sh'
184439 : #> /usr/bin/curl -RsS -o /var/run/ddns/Cloudflare.dat --stderr /var/run/ddns/Cloudflare.err --noproxy '*' --header 'X-Auth-Email: flowersrj' --header 'X-Auth-Key: ***PW***' --header 'Content-Type: application/json' --request GET 'https://api.cloudflare.com/client/v4/zones?name=richnpeg.us'
184440 WARN : CloudFlare reported an error:
184440 : {"success":false,"errors":[{"code":6003,"message":"Invalid request headers","error_chain":[{"code":6102,"message":"Invalid format for X-Auth-Email header"},{"code":6103,"message":"Invalid format for X-Auth-Key header"}]}],"messages":[],"result":null}
184440 ERROR : IP update not accepted by DDNS Provider
184440 : Waiting 900 seconds (Check Interval)