Control subscription from both google server and your app in following way:-

Publish your app with monthly subscription having free trial of seven days. 
After free trial Google will charge your user and send you notification 
onReceive of this notification send it to your server and your server will 
call server side api to cancel this order.(just check if google will refund 
money automatically or not in this case)
http://developer.android.com/google/play/billing/billing_subscriptions.html#cancellation
In this way you can give free trial for one time purchase.

On Wednesday, 3 April 2013 19:51:14 UTC+5:30, Fabien R wrote:
>
> Hello, 
>
> I would like to propose a free trial period for an app. I saw in the dev 
> console that it was only possible for subscriptions. 
> Unfortunately, there is no "one time only" option for subscription. 
> Thus, if the user buys the app, (s)he would be charged every month or 
> year. 
> What alternatives do I have ? 
>
> Thanks in advance, 
> Fabien 
>

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