diff --git a/src/Simplex/Messaging/Notifications/Server/Push/WebPush.hs b/src/Simplex/Messaging/Notifications/Server/Push/WebPush.hs
index 6457d2b84..625113c75 100644
--- a/src/Simplex/Messaging/Notifications/Server/Push/WebPush.hs
+++ b/src/Simplex/Messaging/Notifications/Server/Push/WebPush.hs
@@ -13,20 +13,25 @@
 module Simplex.Messaging.Notifications.Server.Push.WebPush where
 
 import Network.HTTP.Client
-import Simplex.Messaging.Notifications.Protocol (DeviceToken (WPDeviceToken), WPEndpoint (..))
+import Simplex.Messaging.Notifications.Protocol (DeviceToken (WPDeviceToken), WPEndpoint (..), encodePNMessages, PNMessageData)
 import Simplex.Messaging.Notifications.Server.Store.Types
 import Simplex.Messaging.Notifications.Server.Push
 import Control.Monad.Except
 import Control.Logger.Simple (logDebug)
 import Simplex.Messaging.Util (tshow)
 import qualified Data.ByteString.Char8 as B
-import Data.ByteString.Char8 (ByteString)
 import Control.Monad.IO.Class (liftIO)
 import Control.Exception ( fromException, SomeException, try )
 import qualified Network.HTTP.Types as N
+import qualified Data.Aeson as J
+import Data.Aeson ((.=))
+import qualified Data.ByteString.Lazy as BL
+import Data.List.NonEmpty (NonEmpty)
+import qualified Data.Text.Encoding as T
+import qualified Data.Text as T
 
 wpPushProviderClient :: Manager -> PushProviderClient
-wpPushProviderClient mg tkn _ = do
+wpPushProviderClient mg tkn pn = do
       e <- B.unpack <$> endpoint tkn
       r <- liftPPWPError $ parseUrlThrow e
       logDebug $ "Request to " <> tshow r.host
@@ -39,18 +44,27 @@ wpPushProviderClient mg tkn _ = do
       let req = r {
         method = "POST"
         , requestHeaders
-        , requestBody = "ping"
+        , requestBody = RequestBodyLBS $ encodePN pn
         , redirectCount = 0
       }
       _ <- liftPPWPError $ httpNoBody req mg
       pure ()
   where
-    endpoint :: NtfTknRec -> ExceptT PushProviderError IO ByteString
+    endpoint :: NtfTknRec -> ExceptT PushProviderError IO B.ByteString
     endpoint NtfTknRec {token} = do
       case token of
         WPDeviceToken WPEndpoint{ endpoint = e } -> pure e
         _ -> fail "Wrong device token"
 
+encodePN :: PushNotification -> BL.ByteString
+encodePN pn = J.encode $ case pn of
+    PNVerification code -> J.object [ "verification" .= code ]
+    PNMessage d -> J.object [ "message" .= encodeData d ]
+    PNCheckMessages -> J.object [ "checkMessages" .= True ]
+  where
+    encodeData :: NonEmpty PNMessageData -> String
+    encodeData a = T.unpack . T.decodeUtf8 $ encodePNMessages a
+
 liftPPWPError :: IO a -> ExceptT PushProviderError IO a
 liftPPWPError = liftPPWPError' toPPWPError