# Send auto-generated SMS

This endpoint is ideal for sending the automatically generated OTP to the customer by brandname.

The OTP is generated randomly and handled by ViHAT.

## HTTP request

\ <mark style="color:green;">**`GET`**</mark> [https://rest.esms.vn/MainService.svc/json/SendMessageAutoGenCode\_V4\_get?Phone={Phone}\&ApiKey={ApiKey}\&SecretKey={SecretKey}\&TimeAlive={TimeAlive}\&NumCharOfCode={NumCharOfCode}\&Brandname={Brandname}\&Type=2\&message={Content}](http://rest.esms.vn/MainService.svc/json/SendMessageAutoGenCode_V4_get?Phone={Phone}\&ApiKey={ApiKey}\&SecretKey={SecretKey}\&TimeAlive={TimeAlive}\&NumCharOfCode={NumCharOfCode}\&Brandname={Brandname}\&Type=2\&message={Content})<br>

* **Response Type:** <mark style="color:orange;">application/json</mark>

{% code overflow="wrap" %}

```json
curl --location --globoff 'https://rest.esms.vn/MainService.svc/json/SendMessageAutoGenCode_V4_get?Phone={{Phone}}&ApiKey={{ApiKey}}&SecretKey={{SecretKey}}&TimeAlive={{TimeAlive}}&NumCharOfCode={{NumCharOfCode}}&Brandname={{Brandname}}&Type=2&message={{Content}}&IsNumber={{IsNumber}}'
```

{% endcode %}

* **Request body**

<table><thead><tr><th width="183">Parameter</th><th width="117">Type</th><th width="147" data-type="checkbox">Required</th><th>Description</th></tr></thead><tbody><tr><td>Phone</td><td>string</td><td>true</td><td>The phone number of receiver.</td></tr><tr><td>ApiKey</td><td>string</td><td>true</td><td>Your API Key.</td></tr><tr><td>SecretKey</td><td>string</td><td>true</td><td>Your Secret Key.</td></tr><tr><td>TimeAlive</td><td>string</td><td>false</td><td>The time-to-live of the OTP.<br>Unit of cal: <strong>minute</strong> <br>Min: 2<br>Max: 15<br>Do not pass this parameter, default validity is 5 minutes</td></tr><tr><td>NumCharOfCode</td><td>string</td><td>false</td><td>Number of characters in the OTP. Default is 6.</td></tr><tr><td>Brandname</td><td>string</td><td>true</td><td>The name of the sender is shown in the header of the customer's message. <br><strong>Pre-registration is required.</strong></td></tr><tr><td>Type</td><td>string</td><td>true</td><td>2: Send customer care message</td></tr><tr><td>message</td><td>string</td><td>true</td><td><br>The content of message, you shoule place the {OTP} in your content that will contain the the generated OTP.<br>Example:<br>To send the message "12345 is your code."<br>-> The content you should put is "{OTP} is your code."</td></tr><tr><td>IsNumber</td><td>string</td><td>false</td><td>0: mixed between digits and chars.<br>1: only digits.</td></tr></tbody></table>

***

* **Response:**

{% tabs %}
{% tab title="100" %}

```json
{
    "CodeResult": "100",
    "CountRegenerate": 0,
    "SMSID": "d533459ee42b2b9525ba9eabf6a8156"
}
```

**Valid request**
{% endtab %}

{% tab title="101" %}

```json
{
    "CodeResult": "101",
    "CountRegenerate": 0,
    "ErrorMessage": "Authorize Failed"
}
```

**Invalid credential.**
{% endtab %}
{% endtabs %}

* **Response body:**

| Parameter    | Type   | Description                                  |
| ------------ | ------ | -------------------------------------------- |
| CodeResult   | string | Response code.                               |
| SMSID        | string | The message id eSMS system.                  |
| ErrorMessage | string | The error message if the request is invalid. |

* *<mark style="color:yellow;">**The detail of error code can refer at**</mark>* [**Table of error codes**](/en/esms-api/table-of-error-codes.md) **.**
* *<mark style="color:yellow;">**Get the  sample of code for programing languagues to use in Postman refer at**</mark>* [**Link  of code samples**](https://samplefordevelopers.esms.vn/#850974b9-12cf-46f5-946c-e8e15aa3585b)**.**
* <mark style="color:orange;">**Use API Checkcode to check the validation of OTP. See it at**</mark> [**API Checkcode**](/en/esms-api/other-apis/check-code.md)**.**&#x20;


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://developers.esms.vn/en/esms-api/send-sms-api/send-auto-generated-sms.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.