Delivers a bill via email.
| Parameter | Description |
|---|
| billId | The ID of the bill to update. |
| billToken | The token of the requested bill. |
Bill bill = bitpay.getBill("3Zpmji8bRKxWJo2NJbWX5H");
String deliveryResult = bitpay.deliverBill(bill.getId(), bill.getToken());
