in app purchase - What does local caching for android In-app Billing do? -

in app purchase - What does local caching for android In-app Billing do? -

curious... in documentation android in-app billing v3, says:

because google play client caches in-app billing info locally on device, can utilize version 3 api query info more frequently, illustration through getpurchases call. unlike previous versions of api, many version 3 api calls serviced through cache lookups instead of through network connection google play, speeds api's response time.

what mean, or in ways help me? should not bother storing sharedpreferences when user without network connection? need special implement (access cache)?

what allows create more frequent calls update inventory. v3 documentation notes, previous phone call had nail network made more expensive , meant developers discouraged using frequently. now, because of local cache not case.

the downside have seen local cache not date , there appears no quick way forcefulness sync other restarting device or clearing google play cache.

android in-app-purchase in-app-billing