PayPal Instant Payment Notification IPN with empty POST

Question

I use paypal subscriptions (hosted buttons)

auto-return for Website Payments is on
Payment Data Transfer is on
success, fail and notify url are different
extra params for button are:
rm=2
notify_url=<url>
sra=1
rest in PayPal is default.

all works in pro and sandbox

but POST request from IPN come with empty data every time.

• sandbox IPN works.
• request handling is ok - tested with curl.
• history of IPN messages on paypal is ok.

did I forgot something ?

please confirm or reject PayPal problems on your IPN.

Answer 1

I set encoding for IPN to UTF-8 and it works now

my accont => my profile => my selling tools => language encoding