Pushsafer Icon and sound

Hello,
i’m trying to change the default Icon and sound on a Pushsafer Message send to an iOS Device.
The tiltle and the message are send immediately, but the sound and icon are allways the default.
This is how it looks like:

pushsafer_notification:
  sequence:
  - service: notify.pushsafer
    data: 
      title: "Testtitle"
      message: "Testmessage"
      data:
        sound: 15
        icon: 3

Helpful hints are welcome :wink:
Thanks in advance!

just bumping this as I would like to know how as well!