# Send Invoice Email

> For the complete machine-readable documentation index, see [llms.txt](https://apidocs.chargebee.com/llms.txt).


[Idempotency Supported](/docs/api/idempotency)

[Asynchronous](/docs/api/async_response/async-response-object)

Sends the invoice email to the customer using the site's published **Send Invoice Email** Engage notification template.

Use this operation to resend or manually trigger the invoice email for a customer outside the normal notification schedule.

**Async-only** This operation is [asynchronous only](/docs/api/async_response). You must send `Prefer: respond-async`, a unique `chargebee-request-id`, and a `chargebee-async-callback-url`. The HTTP response is `202 Accepted` with an empty body. When processing completes, Chargebee delivers the outcome to your [async callback URL](/docs/api/async_response) — a successful `result` contains [`email_logs`](/docs/api/email_logs).

### Prerequisites & Constraints

-   Email Engage V2 must be enabled for the site.
-   The **Send Invoice Email** notification template must be published and enabled.
-   The from address configured for the notification template must be verified.
-   The customer associated with the invoice must have a valid email address.
-   The invoice `status` must be `paid`, `payment_due`, `not_paid`, or `posted`.

## Sample Request

#### cURL

```bash
curl  https://{site}.chargebee.com/api/v2/invoices/__demo_inv__1/send_email \
     -X POST  \
     -u {site_api_key}:\
     -H "Prefer: respond-async" \
     -H "chargebee-request-id: 7c9e2f4a-8b1d-4e6f-9a0c-merchant-generated-uuid" \
     -H "chargebee-async-callback-url: https://example.com/chargebee/async-callback"
```

#### .NET

```dotnet
using ChargeBee.Api;
using ChargeBee.Models;

ApiConfig.Configure("{site}","{site_api_key}");
EntityResult result = Invoice.SendEmail("__demo_inv__1")
		.Header("Prefer", "respond-async")
		.Header("chargebee-request-id", "7c9e2f4a-8b1d-4e6f-9a0c-merchant-generated-uuid")
		.Header("chargebee-async-callback-url", "https://example.com/chargebee/async-callback")
		.Request();

List<EmailLog> emailLogs = result.EmailLogs;
```

#### Go

```go
package main
import (
    "fmt"
    "github.com/chargebee/chargebee-go/v3"
    invoiceAction "github.com/chargebee/chargebee-go/v3/actions/invoice"
)
func main() {
    chargebee.Configure("{site_api_key}","{site}");
    res,err := invoiceAction.SendEmail("__demo_inv__1").Headers("Prefer", "respond-async").Headers("chargebee-request-id", "7c9e2f4a-8b1d-4e6f-9a0c-merchant-generated-uuid").Headers("chargebee-async-callback-url", "https://example.com/chargebee/async-callback").Request()
    if err != nil {
        fmt.Println(err)
    } else {
        EmailLogs := res.EmailLogs
    }
}
```

#### Go

```go
package main

import (
  "fmt"
  "github.com/chargebee/chargebee-go/v4"
)

func main() {
  config := &chargebee.ClientConfig{
    SiteName: "{site}",
    ApiKey: "{site_api_key}",
  }    
  client := chargebee.NewClient(config)
  req := &chargebee.InvoiceSendEmailRequest{
    Id : "__demo_inv__1",
}
  req.AddHeader("Prefer", "respond-async")
  req.AddHeader("chargebee-request-id", "7c9e2f4a-8b1d-4e6f-9a0c-merchant-generated-uuid")
  req.AddHeader("chargebee-async-callback-url", "https://example.com/chargebee/async-callback")
  res, err := client.Invoice.SendEmail(req)
      if err != nil {
        fmt.Println(err)
    } else {
        EmailLogs := res.EmailLogs
    }
}
```

#### Java

```java
import com.chargebee.*;
import com.chargebee.ListResult;
import com.chargebee.models.*;
import com.chargebee.models.enums.*;
import java.io.IOException;
import java.util.List;

public class Sample {

    public static void main(String args[]) throws IOException, Exception {
        Environment.configure("{site}", "{site_api_key}");
        Result result = Invoice.sendEmail("__demo_inv__1")
            .header("Prefer", "respond-async")
            .header("chargebee-request-id", "7c9e2f4a-8b1d-4e6f-9a0c-merchant-generated-uuid")
            .header("chargebee-async-callback-url", "https://example.com/chargebee/async-callback")
            .request();

        List<EmailLog> emailLogs = result.emailLogs();
    }
}
```

#### Java

```java
import com.chargebee.v4.client.ChargebeeClient;
import com.chargebee.v4.client.request.RequestOptions;
import com.chargebee.v4.models.emailLog.EmailLog;
import com.chargebee.v4.models.invoice.params.InvoiceSendEmailParams;
import com.chargebee.v4.models.invoice.responses.InvoiceSendEmailResponse;
import java.util.List;

public class InvoiceSendEmail {

    public static void main(String[] args) {
        ChargebeeClient client = ChargebeeClient.builder()
            .apiKey("{site_api_key}")
            .siteName("{site}")
            .build();

        InvoiceSendEmailResponse response = client
            .invoices()
            .withOptions(RequestOptions.builder()
                .header("Prefer", "respond-async")
                .header("chargebee-request-id", "7c9e2f4a-8b1d-4e6f-9a0c-merchant-generated-uuid")
                .header("chargebee-async-callback-url", "https://example.com/chargebee/async-callback")
                .build())
            .sendEmail("__demo_inv__1");

        List<EmailLog> emailLogs = response.getEmailLogs();
    }
}
```

#### Node.js

```node
import Chargebee from "chargebee";

const chargebee = new Chargebee({
    site: "{site}",
    apiKey: "{site_api_key}",
});

try {
    const result = await chargebee.invoice.sendEmail("__demo_inv__1", {
        "Prefer": "respond-async",
        "chargebee-request-id": "7c9e2f4a-8b1d-4e6f-9a0c-merchant-generated-uuid",
        "chargebee-async-callback-url": "https://example.com/chargebee/async-callback"
    });

    console.log(result);
    const emailLogs = result.email_logs;
} catch (err) {
    console.log(err);
}
```

#### PHP

```php
<?php

require __DIR__ . '/vendor/autoload.php';

use Chargebee\ChargebeeClient;

$chargebee = new ChargebeeClient(options: [
    "site" => "{site}",
    "apiKey" => "{site_api_key}",
]);
$result = $chargebee->invoice()->sendEmail("__demo_inv__1", ["Prefer" => "respond-async", "chargebee-request-id" => "7c9e2f4a-8b1d-4e6f-9a0c-merchant-generated-uuid", "chargebee-async-callback-url" => "https://example.com/chargebee/async-callback"]);
$emailLogs = $result->email_logs;
```

#### Python

```python
from chargebee import Chargebee

cb_client = Chargebee(api_key="{site_api_key}", site="{site}")
response = cb_client.Invoice.send_email("__demo_inv__1", headers={"Prefer": "respond-async", "chargebee-request-id": "7c9e2f4a-8b1d-4e6f-9a0c-merchant-generated-uuid", "chargebee-async-callback-url": "https://example.com/chargebee/async-callback"})
email_logs = response.email_logs
```

#### Ruby

```ruby
require 'chargebee'

ChargeBee.configure(:site => "{site}",
  :api_key => "{site_api_key}")

result = ChargeBee::Invoice.send_email("__demo_inv__1", nil, {"Prefer" => "respond-async", "chargebee-request-id" => "7c9e2f4a-8b1d-4e6f-9a0c-merchant-generated-uuid", "chargebee-async-callback-url" => "https://example.com/chargebee/async-callback"})

email_logs = result.email_logs
```

## Sample Response

```json
{
  "email_logs": [
    {
      "id": "__test__8asukSOX7flkT",
      "object": "email_log",
      "template_name": "Send Invoice Email",
      "from_address": "billing@acmeinc.com",
      "to_address": "john@user.com",
      "subject": "Invoice from Acme Inc.",
      "status": "succeeded",
      "customer_id": "__test__8aswXTV3cHBBk"
    },
    {..}
  ]
}
```

## URL Format

**POST** https://[site].chargebee.com/api/v2/invoices/{invoice-id}/send_email

## Returns

- `email_logs` (always returned)
  List of [email log](/docs/api/email_logs) objects for the send request. Each entry describes one email that was sent or attempted.