private async Task DeleteEntity(int id)
        {
            var request = new FortnoxApiRequest(this.connectionSettings.AccessToken, this.connectionSettings.ClientSecret);

            await SupplierInvoiceExternalURLConnectionsService
            .DeleteSupplierInvoiceExternalURLConnectionsAsync(
                request,
                id.ToString()
                );
        }
        public async Task DeleteSupplierInvoiceExternalUrlConnectionTest()
        {
            var request  = new FortnoxApiRequest(this.connectionSettings.AccessToken, this.connectionSettings.ClientSecret);
            var response = await CreateEntity(1);

            await SupplierInvoiceExternalURLConnectionsService
            .DeleteSupplierInvoiceExternalURLConnectionsAsync(
                request,
                response.Id.ToString()
                );
        }