export interface IAPProduct {
    productId: string;
    title: string;
    description: string;
    price: string;
    localizedPrice: string;
    currencyCode: string;
}
export interface IAPResult {
    status: 'purchased' | 'restored' | 'cancelled' | 'deferred';
    productId: string;
    transactionId?: string;
    originalTransactionId?: string;
    /** Base64 App Store receipt; send to your backend for validation. */
    receipt?: string;
}
export interface IAPProductsResult {
    products: IAPProduct[];
    invalidProductIds: string[];
}

export abstract class IAPImpl {
    abstract init(products: string[]): Promise<IAPProductsResult>;

    abstract purchase(product: string): Promise<IAPResult>;
    abstract restore(): Promise<IAPResult[]>;
    abstract getPendingTransactions(): Promise<IAPResult[]>;
    /** Only call after verification and idempotent delivery of the purchase. */
    abstract finishTransaction(transactionId: string): Promise<void>;
    abstract onTransaction(listener: (transaction: IAPResult) => void): () => void;
}