diff --git a/flexiapi/README.md b/flexiapi/README.md
index 308659d..43ca87d 100644
--- a/flexiapi/README.md
+++ b/flexiapi/README.md
@@ -74,6 +74,17 @@ If you set `INSTANCE_CUSTOM_THEME` to true, FlexiAPI will try to load a CSS file
 
 We advise you to copy the `style.css` file and rename it to make your custom CSS configurations for your instance.
 
+#### Flexisip Push notifications pusher
+
+The API endpoint `POST /tokens` uses the `flexisip_pusher` binary delivered by the [Flexisip](https://gitlab.linphone.org/BC/public/flexisip) project (and related package). You must configure the `APP_FLEXISIP_PUSHER_PATH` environement variable to point to the correct binary.
+
+    APP_FLEXISIP_PUSHER_PATH=/opt/belledonne-communications/bin/flexisip_pusher
+
+This binary will be executed under "web user" privileges. Ensure that all the related files required by `flexisip_pusher` can be accessed using this user account.
+
+    /var/opt/belledonne-communications/log/flexisip/flexisip-pusher.log // Write permissions
+    /etc/flexisip/apn/*pem // Read permissions
+
 ### systemd restrictions
 
 To retrieve the devices configuration, FlexiAPI connects to the UNIX socket opened by Flexisip. The socket is located in the `/tmp` directory.
diff --git a/flexiapi/app/Libraries/FlexisipPusherConnector.php b/flexiapi/app/Libraries/FlexisipPusherConnector.php
index 595756a..f642691 100644
--- a/flexiapi/app/Libraries/FlexisipPusherConnector.php
+++ b/flexiapi/app/Libraries/FlexisipPusherConnector.php
@@ -39,10 +39,11 @@ class FlexisipPusherConnector
         $payload = json_encode(['token' => $token]);
 
         $command = $this->pusherPath
-            . " --pn-provider " . $this->pnProvider
-            . " --pn-param " . $this->pnParam
+            . " --pn-provider '" . $this->pnProvider . "'"
+            . " --pn-param '" . $this->pnParam . "'"
             . " --pn-prid " . $this->pnPrid
-            . " --apple-push-type Background --customPayload " . $payload;
+            . " --apple-push-type Background"
+            . " --customPayload '" . $payload . "'";
 
         $output = null;
         $retval = null;
diff --git a/flexisip-account-manager.spec b/flexisip-account-manager.spec
index 22355e8..c4f17e4 100644
--- a/flexisip-account-manager.spec
+++ b/flexisip-account-manager.spec
@@ -8,7 +8,7 @@
 #%define _datadir           %{_datarootdir}
 #%define _docdir            %{_datadir}/doc
 
-%define build_number 74
+%define build_number 75
 %define var_dir /var/opt/belledonne-communications
 %define opt_dir /opt/belledonne-communications/share/flexisip-account-manager