javascript - IPN(notify url) page is not being called -

i working on paypal sandbox. transaction working , return url being called ,

but ipn(notify url) page not being called.

i have enabled notify url account also. both caller , listener pages uploaded on server. uploaded listener page's url set in code following. notify url not being called.plz 1 can me.

<script  data-env="sandbox"  data-callback="http://mysite.com/ipnpage.aspx"  data-tax="2"  data-shipping="5"  data-currency="usd"  data-amount="<%= session["final_total"]%>" data-quantity="1"  data-name="fees" data-number="123" data-custom="<%= session["sb"]%>" data-return="http://mysite.com/ipnpage.aspx"   ....></script> 

i wandering since last 3 days, not solution. plz idea.

check ipn history of account should sending ipn's. here can confirm or deny paypal indeed sending ipn's. can see result see whether shows completed or failed. script has issue it.

also check own web server logs see if url getting hit , returning failure of sort.

if ipn history doesn't show notifications being sent don't have configured correctly. i'd need @ actual api request code put here seems generates it, doesn't help. need see actual request.