> ## Documentation Index
> Fetch the complete documentation index at: https://docs.rebellapp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Send Email

> Send email notifications to users via access tokens.

`POST /v1/messages/sendEmail`

Enables merchants to send email messages to users via their access tokens.

## Request Parameters

<ParamField body="accessToken" type="string" required>
  Auth token identifying the target user.

  **Max length**: 128 characters
</ParamField>

<ParamField body="requestId" type="string" required>
  Unique transaction ID for idempotency.

  **Max length**: 128 characters
</ParamField>

<ParamField body="templateCode" type="string" required>
  Template identifier for the email.

  **Max length**: 256 characters
</ParamField>

<ParamField body="templates" type="array" required>
  Content templates. Maximum 5 items. Each item is a `ContentTemplate` object.

  <Expandable title="ContentTemplate fields">
    | Field              | Type                | Required | Description                               |
    | ------------------ | ------------------- | -------- | ----------------------------------------- |
    | templateParameters | Map\<String,String> | O        | Key-value pairs for variable substitution |
    | language           | String              | O        | Supported: `en-US`, `zh-CN`, `it-IT`      |
  </Expandable>
</ParamField>

<ParamField body="authClientId" type="string">
  Unique auth client ID.

  **Max length**: 128 characters
</ParamField>

<ParamField body="extendInfo" type="string">
  Additional metadata.

  **Max length**: 4096 characters
</ParamField>

## Response Parameters

<ResponseField name="result" type="object" required>
  Standard result object with `resultCode`, `resultStatus`, `resultMessage`
</ResponseField>

<ResponseField name="messageId" type="string">
  Unique message identifier.
</ResponseField>

<ResponseField name="extendInfo" type="string">
  Additional response metadata.
</ResponseField>

## Result Codes

| resultStatus | resultCode                       | Description                              |
| ------------ | -------------------------------- | ---------------------------------------- |
| `S`          | `SUCCESS`                        | Email sent successfully                  |
| `F`          | `INVALID_AUTH_CLIENT`            | Invalid authentication client            |
| `F`          | `USER_STATUS_ERROR`              | Account locked or unregistered           |
| `F`          | `VERIFY_REQUEST_ID_INVALID`      | Malformed `requestId`                    |
| `F`          | `TEMPLATE_VARIABLE_NOT_COMPLETE` | Incomplete template variable replacement |
| `F`          | `GOTONE_UNIQ_ERROR`              | Duplicate request detected               |
| `U`          | `UNKNOWN_EXCEPTION`              | Unknown error occurred                   |