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

# Send Email To User

## Endpoint Overview

**POST** `https://api.unibee.dev/merchant/email/send_email_to_user`

Send Email To User

***

## Authorization

All UniBee Merchant API requests require authentication via API key.

| Header          | Required | Description                           |
| --------------- | -------- | ------------------------------------- |
| `Authorization` | Yes      | Bearer `<your_api_key>`               |
| `Content-Type`  | Yes      | `application/json` (for request body) |

***

## Parameters

Parameters for this endpoint are listed below. The schema is also shown in the Try it panel.

### Request body

| Name                | Type   | Required | Description                                                                                      |
| ------------------- | ------ | -------- | ------------------------------------------------------------------------------------------------ |
| `attachInvoiceId`   | string | No       | AttachInvoiceId                                                                                  |
| `content`           | string | No       |                                                                                                  |
| `email`             | string | Yes      | Email                                                                                            |
| `gatewayName`       | string | No       | The name of email gateway, available for sendgrid\|smtp, default gateway will use if not provide |
| `gatewayTemplateId` | string | No       | GatewayTemplateId                                                                                |
| `language`          | string | No       | Language                                                                                         |
| `subject`           | string | No       |                                                                                                  |
| `variables`         | object | No       | Variables，Map                                                                                    |

***

## Request examples

### cURL

```bash theme={null}
curl -X POST "https://api.unibee.dev/merchant/email/send_email_to_user" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "attachInvoiceId": "id_example",
  "content": "",
  "email": "user@example.com",
  "gatewayName": "",
  "gatewayTemplateId": "id_example",
  "language": "",
  "subject": "",
  "variables": {}
}'
```

### Sandbox

```bash theme={null}
curl -X POST "https://api-sandbox.unibee.top/merchant/email/send_email_to_user" \
  -H "Authorization: Bearer YOUR_SANDBOX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "attachInvoiceId": "id_example",
  "content": "",
  "email": "user@example.com",
  "gatewayName": "",
  "gatewayTemplateId": "id_example",
  "language": "",
  "subject": "",
  "variables": {}
}'
```

***

## Response

Success responses return a JSON envelope with `code`, `data`, `message`, `redirect`, and `requestId`. `code` `0` indicates success. The response schema for this endpoint is shown below.

***

## Error handling

| HTTP status | Meaning                                                                   |
| ----------- | ------------------------------------------------------------------------- |
| 400         | Bad request — invalid or missing parameters. Check `message` in the body. |
| 401         | Unauthorized — missing or invalid API key.                                |
| 404         | Not found — invalid path or resource.                                     |
| 500         | Server error — retry with backoff.                                        |

When `code` in the response body is non-zero, check `message` for details. Use `requestId` when contacting support.


## OpenAPI

````yaml post /merchant/email/send_email_to_user
openapi: 3.0.0
info:
  description: UniBee Api Server
  license:
    name: Apache-2.0
    url: https://www.apache.org/licenses/LICENSE-2.0.html
  title: OpenAPI UniBee
  version: daily,buildtime:202603161017
servers:
  - url: https://api.unibee.dev
  - url: https://api-sandbox.unibee.top
security:
  - Authorization: []
paths:
  /merchant/email/send_email_to_user:
    post:
      tags:
        - Email
      summary: Send Email To User
      requestBody:
        content:
          application/json:
            schema:
              $ref: >-
                #/components/schemas/unibee.api.merchant.email.SendEmailToUserReq
        required: true
      responses:
        '200':
          content:
            application/json:
              schema:
                properties:
                  code:
                    format: int
                    properties: {}
                    type: integer
                  data:
                    properties: {}
                    type: object
                  merchantId:
                    format: int64
                    properties: {}
                    type: integer
                  message:
                    format: string
                    properties: {}
                    type: string
                  redirect:
                    format: string
                    properties: {}
                    type: string
                  requestId:
                    format: string
                    properties: {}
                    type: string
                type: object
          description: ''
components:
  schemas:
    unibee.api.merchant.email.SendEmailToUserReq:
      properties:
        attachInvoiceId:
          description: AttachInvoiceId
          format: string
          properties: {}
          type: string
        content:
          format: string
          properties: {}
          type: string
        email:
          description: Email
          format: string
          properties: {}
          type: string
        gatewayName:
          description: >-
            The name of email gateway, available for sendgrid|smtp, default
            gateway will use if not provide
          format: string
          properties: {}
          type: string
        gatewayTemplateId:
          description: GatewayTemplateId
          format: string
          properties: {}
          type: string
        language:
          description: Language
          format: string
          properties: {}
          type: string
        subject:
          format: string
          properties: {}
          type: string
        variables:
          additionalProperties:
            $ref: '#/components/schemas/interface'
          description: Variables，Map
          format: map[string]interface {}
          properties: {}
          type: object
      required:
        - email
      type: object
    interface:
      properties: {}
      type: object
  securitySchemes:
    Authorization:
      bearerFormat: JWT
      scheme: bearer
      type: http

````