BlackBerry® World™ Development

[thubalek]

Hello,

I didn't found in documentation how often I can call Payment Manager (Cascades, BB10) for detection of purchased digital goods.

I'm doing it everytime app starts hoping that it is somewhere cached but not sure whether it is good idea. 

Can anybody from BB suggest what is best practice?

Tom

[peter9477]

I'm fairly sure best practice would be for you to cache the information locally yourself, to avoid any unnecessary network activity. I've seen nothing in the docs to suggest it would be caching anything like that in a central location. I don't know for sure that it doesn't, but that's the sort of thing I'd expect to see documented clearly if they were doing it.

[thubalek]

There are signs of caching in the documentation.

See parameter  forceServerRefresh at https://developer.blackberry.com/cascades/reference/bb__platform__paymentmanager.html#requestexistin...

I want to avoid caching on my side if Blackberry Platform already does it. 

This is the reason why I'm asking here and hoping to get ultimate response from Blackberry.

[gbeukeboom · Accepted solution]

Hi there,

The App World cache should be thought of in the same way as a browser's cache, data will get cached but could be cleared out at any time if desired by the app (in this case App World).

The recommended approach would be to first try to retrieve purchases from the cache, if these do not exist then you could refresh from the App World Server.

Another good idea would be to store these purchases yourself rather than relying on App World at all. This will save you from having to check for existing purchases over the network every time the app is launched.

[thubalek]

Thanks for reply gbeukeboom

Not much happy with this answer as it means that thousands developers have to implement their own caching instead of having it in one place (= in appworld). So there will be exactly the same issues with license verification as on Android are. 

Tom

P.S. I would really appreciate if this is written in documentation for Payment Manager.

[gbeukeboom]

Hi Tom,

Developers don't "need" to implement storing the digital goods themselves, all data can be retrieved from App World either using the cache or network and actually a network refresh of App World should always be done at least once in the application lifecycle to account for a few scenarios.

The App World cache should be a good place to check for this data, but it cannot be guaranteed to be there all of the time.