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