> For the complete documentation index, see [llms.txt](https://onestore-dev.gitbook.io/dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://onestore-dev.gitbook.io/dev/cht/tools/billing/v21/references/interfaces.md).

# Interfaces

* [AcknowledgeListener](/dev/cht/tools/billing/v21/references/interfaces/acknowledgelistener.md)
* [ConsumeListener](/dev/cht/tools/billing/v21/references/interfaces/consumelistener.md)
* [IapResultListener](/dev/cht/tools/billing/v21/references/interfaces/iapresultlistener.md)
* [ProductDetailsListener](/dev/cht/tools/billing/v21/references/interfaces/productdetailslistener.md)
* [PurchaseClientStateListener](/dev/cht/tools/billing/v21/references/interfaces/purchaseclientstatelistener.md)
* [PurchasesListener (deprecated)](/dev/cht/tools/billing/v21/references/interfaces/purchaseslistener-deprecated.md)
* [PurchasesUpdatedListener](/dev/cht/tools/billing/v21/references/interfaces/purchasesupdatedlistener.md)
* [QueryPurchasesListener](/dev/cht/tools/billing/v21/references/interfaces/querypurchaseslistener.md)
* [RecurringProductListener](/dev/cht/tools/billing/v21/references/interfaces/recurringproductlistener.md)
* [StoreInfoListener](/dev/cht/tools/billing/v21/references/interfaces/storeinfolistener.md)