Function getInvoices

Returns Promise<
    {
        customer?: {
            birthday?: string;
            city?: string;
            company?: string;
            country?: string;
            email?: string;
            firstName?: string;
            houseNumber?: string;
            id: number;
            lastName?: string;
            notes?: string[];
            phone?: string;
            postCode?: string;
            salutation?: string;
            street?: string;
            timestamp?: string;
            uid_number?: string;
        };
        id: number;
        isCanceled: boolean;
        items: {
            discount: number;
            id: number;
            name: string;
            price: number;
            quantity: number;
            taxRate: number;
        }[];
        paymentType: string;
        system_id?: unknown;
        timestamp: string;
        total: number;
    }[],
>