/// <summary>
/// Sends an invoice, by ID, to a customer.<blockquote><strong>Note:</strong> After you send an invoice, you cannot resend it.</blockquote><br/>Optionally, set the `notify_merchant` query parameter to also send the merchant an invoice update notification. Default is `true`.
/// </summary>
/// <param name="apiContext">APIContext used for the API call.</param>
/// <param name="notifyMerchant">Indicates whether to send the invoice update notification to the merchant. Default is `true`.</param>
public void Send(APIContext apiContext, bool notifyMerchant = true)
{
Invoice.Send(apiContext, this.id, notifyMerchant);
}