| IAcknowledgeResponseListener | Interface to handle the response of acknowledging non-consumable purchases. |
| IAppCoinsBillingStateListener | Interface to listen for billing setup and disconnection events. |
| IAptoideAccountStateListener | Interface to listen for Aptoide account sign-in state changes. |
| IAptoideSignInResponseListener | Interface to handle the result of an Aptoide account sign-in. |
| IConsumeResponseListener | Interface to handle the response of consuming purchases. |
| IPurchasesUpdatedListener | Interface to handle updates for purchases, including initiated and Play Store purchases. |
| ISkuDetailsResponseListener | Interface to handle the response for SKU details queries. |