> 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/eng/tools/billing/v21/references/interfaces.md).

# Interfaces

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