export interface InitOptions {
    client_id: string;
    client_secret?: string;
    fetch?: Fetch;
    storage?: StorageFactory;
    host?: string;
    version?: string;
    application?: string;
    currency?: string;
    customer_token?: string;
    headers?: Headers;
}
export interface Options {
    fetch?: Fetch;
    application?: string;
    currency?: string;
    customer_token?: string;
    host?: string;
    version?: string;
    headers?: Headers;
}
export interface Headers {
    [key: string]: string;
}
export interface AuthBody {
    grant_type: 'client_credentials' | 'implicit';
    client_id: string;
    client_secret?: string;
}
export interface StorageFactory {
    set(key: string, value: string): void;
    get(key: string): string | null;
    delete(key: string): void;
}
export interface Fetch {
    (input?: Request | string, init?: RequestInit): Promise<Response>;
}
export interface Credentials {
    client_id: string;
    access_token: string;
    expires: number;
}