2checkout.com instant notifcations failed

hi

ever since i moved to Cloudflare instant notification services from 2checkout.com to my site is failing.

however ipn messages from paypal works well

any help would be appreciated

2checkout team suggested below things

"2Checkout INS will send HTTP posts from the below IP addresses using ports 80 and 443:

PRODUCTION:

64.128.115.196
68.171.193.196
162.221.60.196
162.221.61.196
64.128.162.234

Also, we recommend you to allowlist these IP’s so that they are not blocked by your server.
"

anybody any help?

@pat from Cloudflare , could you help please ?

Did you whitelist those IP addresses in your Cloudflare firewall?

yes please

anything else ? still it is failing