iphone - Is there any way to add pre-existing users to the "paid list" for new iOS in-app purchases? -

iphone - Is there any way to add pre-existing users to the "paid list" for new iOS in-app purchases? -

i in tricky spot , trying figure out best way proceed. released app few months ago , have charged few hundred people $.99 it. interested in making app free in-app purchases. how can create whoever has paid it, doesn't need pay again? can programmatically "white list" them? , charge future users?

i have integrated game center toying around thought of checking users on leader boards already?

i can't create separate app, wondering if there api or route utilize accomplish this.

thanks!

here's potential strategy:

1) create in-app purchase toggle enables access features or resources in app.

2) alter name or location of key file. database easiest (if have one), user defaults or other saved files.

3) on launch of new version, check see if older thing exists - if so, save marker key keychain app (and if renamed database move old version new name/location!). keychain nice place set persists between app installs. i'm not sure if icloud backs though.

4) when checking feature marker key in keychain in add-on asking storekit if have purchased items want unlocked them.

5) in ui block purchase , indicate have paid.

that's best can do, may have deleted app altogether , in case there's nil can help them... may want create kind of one-time utilize code unlock feature in same way (except code verified app against server used when allowed it), way help out individuals contacting saying had purchased app before. there's no way verify it's client service allow them have upgrade anyway.

iphone ios in-app-purchase upgrade