# Create contact

> POST /contacts — add a contact to a sending domain (upsert by email).

`POST /contacts`

Add a contact to one of your **sending domains**. Contacts are domain-scoped: pass the `domain` the contact belongs to along with the required `email`. If a contact with that email already exists in the domain, it is **updated** instead of duplicated (upsert by email). Passing `audience_id` on this endpoint is rejected with a `422` — use the [audience-scoped variant](#audience-scoped-variant) below when you want to target an audience explicitly.

**Body**

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `domain` | string | Yes | The sending domain the contact belongs to (one of your domains, e.g. `yourdomain.com`). |
| `email` | string | Yes | The contact’s email address. Stored lowercased. Must be a valid email. |
| `first_name` | string | No | Optional first name. Stored as null when omitted. |
| `last_name` | string | No | Optional last name. Stored as null when omitted. |
| `unsubscribed` | boolean | No | Optional opt-out flag. Defaults to false. When true, campaigns skip this contact. |
| `properties` | object | No | Optional map of custom property keys and values to attach to the contact (e.g. `{ "company_name": "Acme Corp", "score": 10 }`). Each key must be a registered contact property and the value must match its declared type (`string` or `number`). |

**Node.js**

```js
import { SendPing } from 'sendping';

const mb = new SendPing('mb_xxxxxxxxx');

const { data, error } = await mb.contacts.create({
  "domain": "yourdomain.com",
  "email": "steve@example.com",
  "first_name": "Steve",
  "last_name": "Wozniak",
  "unsubscribed": false
});
console.log({ data, error });
```

**Ruby**

```ruby
require "sendping"

SendPing.api_key = "mb_xxxxxxxxx"

SendPing::Contacts.create({
  "domain": "yourdomain.com",
  "email": "steve@example.com",
  "first_name": "Steve",
  "last_name": "Wozniak",
  "unsubscribed": false
})
```

**PHP**

```php
<?php
require 'vendor/autoload.php';

use SendPing\SendPing;

$sendping = SendPing::client('mb_xxxxxxxxx');

$sendping->contacts->create([
  'domain' => "yourdomain.com",
  'email' => "steve@example.com",
  'first_name' => "Steve",
  'last_name' => "Wozniak",
  'unsubscribed' => false
]);
```

**Python**

```python
import sendping

sendping.api_key = "mb_xxxxxxxxx"

sendping.Contacts.create({
  "domain": "yourdomain.com",
  "email": "steve@example.com",
  "first_name": "Steve",
  "last_name": "Wozniak",
  "unsubscribed": False
})
```

**Go**

```go
import "github.com/shekhu10/sendping-sdks/sendping-go"

client := sendping.NewClient("mb_xxxxxxxxx")

contact, err := client.Contacts.Create(&sendping.CreateContactRequest{
    Domain:       "yourdomain.com",
    Email:        "steve@example.com",
    FirstName:    "Steve",
    LastName:     "Wozniak",
    Unsubscribed: false,
})
```

**Rust**

```rust
use sendping::{CreateContactOptions, SendPing};

let mb = SendPing::new("mb_xxxxxxxxx");

let params = CreateContactOptions::new("steve@example.com")
    .with_domain("yourdomain.com")
    .with_first_name("Steve")
    .with_last_name("Wozniak")
    .with_unsubscribed(false);
let _contact = mb.contacts.create(params).await?;
```

**Java**

```java
import co.sendping.SendPing;
import co.sendping.SendPingResponse;
import co.sendping.requests.CreateContactRequest;

SendPing sendping = new SendPing("mb_xxxxxxxxx");

CreateContactRequest request = CreateContactRequest.builder()
        .domain("yourdomain.com")
        .email("steve@example.com")
        .firstName("Steve")
        .lastName("Wozniak")
        .unsubscribed(false)
        .build();

SendPingResponse response = sendping.contacts().create(request);
```

**.NET**

```csharp
using SendPing;

ISendPing sendping = SendPingClient.Create("mb_xxxxxxxxx");

var resp = await sendping.ContactCreateAsync(new ContactCreateOptions
{
    Domain = "yourdomain.com",
    Email = "steve@example.com",
    FirstName = "Steve",
    LastName = "Wozniak",
    Unsubscribed = false,
});
```

**cURL**

```bash
curl -X POST 'https://www.sendping.co/api/contacts' \
  -H 'Authorization: Bearer mb_xxxxxxxxx' \
  -H 'Content-Type: application/json' \
  -d '{
  "domain": "yourdomain.com",
  "email": "steve@example.com",
  "first_name": "Steve",
  "last_name": "Wozniak",
  "unsubscribed": false
}'
```

**CLI**

```bash
sendping contacts create \
  --domain 'yourdomain.com' \
  --email 'steve@example.com' \
  --first-name 'Steve' \
  --last-name 'Wozniak'
```

**Response (201)**

```json
{
  "object": "contact",
  "id": "479e3145-dd0e-4f64-bf48-1d4b6d4cd8f6"
}
```

> **Note:** Upsert: re-posting an existing email merges the incoming `first_name`, `last_name`, and `properties` into the existing contact (preserving existing name values when omitted) and applies `unsubscribed` monotonically (once unsubscribed, a re-post cannot resubscribe). Use [PATCH](https://www.sendping.co/docs/api/contacts-update) to change only some fields.

## Audience-scoped variant

The nested route `POST /audiences/:audience_id/contacts` still works and adds the contact to a specific audience instead of a domain — no `domain` field in the body:

**Node.js**

```js
import { SendPing } from 'sendping';

const mb = new SendPing('mb_xxxxxxxxx');

const { data, error } = await mb.contacts.create({
  audienceId: 'AUDIENCE_ID',
  "email": "steve@example.com",
  "first_name": "Steve",
  "last_name": "Wozniak",
  "unsubscribed": false
});
console.log({ data, error });
```

**Ruby**

```ruby
require 'net/http'
require 'uri'

uri = URI('https://www.sendping.co/api/audiences/AUDIENCE_ID/contacts')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
req = Net::HTTP::Post.new(uri)
req['Authorization'] = 'Bearer mb_xxxxxxxxx'
req['Content-Type'] = 'application/json'
req.body = <<~JSON
{
  "email": "steve@example.com",
  "first_name": "Steve",
  "last_name": "Wozniak",
  "unsubscribed": false
}
JSON
res = http.request(req)
puts res.body
```

**PHP**

```php
<?php
require 'vendor/autoload.php';

use SendPing\SendPing;

$sendping = SendPing::client('mb_xxxxxxxxx');

$sendping->contacts->create([
  'audienceId' => "AUDIENCE_ID",
  'email' => "steve@example.com",
  'first_name' => "Steve",
  'last_name' => "Wozniak",
  'unsubscribed' => false
]);
```

**Python**

```python
import requests

res = requests.post(
    "https://www.sendping.co/api/audiences/AUDIENCE_ID/contacts",
    headers={"Authorization": "Bearer mb_xxxxxxxxx", "Content-Type": "application/json"},
    json={
  "email": "steve@example.com",
  "first_name": "Steve",
  "last_name": "Wozniak",
  "unsubscribed": false
},
)
print(res.json())
```

**Go**

```go
import "github.com/shekhu10/sendping-sdks/sendping-go"

client := sendping.NewClient("mb_xxxxxxxxx")

contact, err := client.Contacts.Create(&sendping.CreateContactRequest{
    AudienceId:   "AUDIENCE_ID",
    Email:        "steve@example.com",
    FirstName:    "Steve",
    LastName:     "Wozniak",
    Unsubscribed: false,
})
```

**Rust**

```rust
use sendping::{CreateContactOptions, SendPing};

let mb = SendPing::new("mb_xxxxxxxxx");

let params = CreateContactOptions::new("steve@example.com")
    .with_audience_id("AUDIENCE_ID")
    .with_first_name("Steve")
    .with_last_name("Wozniak")
    .with_unsubscribed(false);
let _contact = mb.contacts.create(params).await?;
```

**Java**

```java
import co.sendping.SendPing;
import co.sendping.SendPingResponse;
import co.sendping.requests.CreateContactRequest;

SendPing sendping = new SendPing("mb_xxxxxxxxx");

CreateContactRequest request = CreateContactRequest.builder()
        .audienceId("AUDIENCE_ID")
        .email("steve@example.com")
        .firstName("Steve")
        .lastName("Wozniak")
        .unsubscribed(false)
        .build();

SendPingResponse response = sendping.contacts().create(request);
```

**.NET**

```csharp
using SendPing;

ISendPing sendping = SendPingClient.Create("mb_xxxxxxxxx");

var resp = await sendping.ContactCreateAsync(new ContactCreateOptions
{
    AudienceId = "AUDIENCE_ID",
    Email = "steve@example.com",
    FirstName = "Steve",
    LastName = "Wozniak",
    Unsubscribed = false,
});
```

**cURL**

```bash
curl -X POST 'https://www.sendping.co/api/audiences/AUDIENCE_ID/contacts' \
  -H 'Authorization: Bearer mb_xxxxxxxxx' \
  -H 'Content-Type: application/json' \
  -d '{
  "email": "steve@example.com",
  "first_name": "Steve",
  "last_name": "Wozniak",
  "unsubscribed": false
}'
```

A missing `email` returns `422 missing_required_field`; an invalid email, a missing `domain`, or a `domain` that is not one of yours returns `422 validation_error`. An audience id that is not yours returns `404 not_found`. See [Errors](https://www.sendping.co/docs/api/errors).