IAP and QML? Howto???

[whiteF]

hi,
over 6 hours iam sitting here and i have no solution!!

i have a qt quick application for symbian devices.
I want to know how i can use IAP in my QML App.

can anybody give me a easy sample?!
(mototrialracer.pro is already used with no solution )

Can somebody create that?
The BG Screen is black.
1 Buy-Button in the middle
OnClick the buyscreen should appear.
After buying the bg screen should be white.


a step-by-step guide would be nice

a content at publish.nokia.com with 2 in-app items i have already created.



Why that dont work?

MouseArea {
id: mouse_area2
x: 0
y: 0
hoverEnabled: false
anchors.fill: parent
onClicked: { purchaseProduct(917242)
}
}

Output: ReferenceError: Can't find variable: purchaseProduct