# Purchase OA package

This endpoint is used for purchase the OA package.

## HTTP request

\ <mark style="color:yellow;">**`POST`**</mark> <https://rest.esms.vn/MainService.svc/json/RegisOAPackageJson/><br>

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

```json
curl --location 'https://rest.esms.vn/MainService.svc/json/RegisOAPackageJson/' \
--header 'Content-Type: application/json' \
--data '{
    "ApiKey":"{{ApiKey}}",
    "SecretKey":"{{SecretKey}}",
    "Dateactive":"{{Dateactive}}",
    "Duaration":"{{Duaration}}",
    "OAID":"{{OAID}}",
    "Package":{{Package}}
}'
```

* **Request body:**

<table><thead><tr><th width="157">Paramter</th><th width="129">Type</th><th width="154" data-type="checkbox">Required</th><th>Description</th></tr></thead><tbody><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>Dateactive</td><td>string</td><td>true</td><td>The active date of OA.<br>Format: yyyy-MM-dd</td></tr><tr><td>Duaration</td><td>string</td><td>true</td><td>The duration of OA package</td></tr><tr><td>OAID</td><td>string</td><td>true</td><td><p>Zalo OA Id is the Zalo Official Account Id of the organization. It can be obtained by accessing to the Zalo administrator page.</p><p><strong>Note: Pre-registration is required.</strong></p></td></tr><tr><td>Package</td><td>string</td><td>true</td><td>List of OA packages.<br>- 1: Trial<br>- 2: Advanced<br>- 3: Premium</td></tr></tbody></table>

***

* **Response:**

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

```
{
    "CodeResult": "100",
    "ErrorMessage": "ViHAT is censoring trademark ownership",
    "ServicePreviewId": 52330
}
```

**Valid request.**
{% endtab %}
{% endtabs %}

* **Response body:**

<table><thead><tr><th>Parameter</th><th width="194">Type</th><th>Description</th></tr></thead><tbody><tr><td>CodeResult</td><td>string</td><td>Response code.</td></tr><tr><td>ErrorMessage</td><td>string</td><td>The message error in case of invalid request.</td></tr><tr><td>ServicepreviewId</td><td>string</td><td>eSMS registration ID of OA.</td></tr></tbody></table>

* *<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)**.**


---

# 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/retrive-and-register-functions/purchase-oa-package.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.