---
title: "Check topic subscriber"
method: GET
path: "/v1/topics/{topicKey}/subscribers/{externalSubscriberId}"
tags: ["Topics"]
---

# Check topic subscriber

`GET /v1/topics/{topicKey}/subscribers/{externalSubscriberId}`

## Request

- Base URL: `https://api.notifly.io`
- URL: `https://api.notifly.io/v1/topics/{topicKey}/subscribers/{externalSubscriberId}`
- Auth: API key in header `Authorization`

Check if a subscriber belongs to a certain topic

## Path parameters

- `externalSubscriberId` string, required
- `topicKey` string, required

## Response `200`

- TopicSubscriberDto
  - `_organizationId` string, required: Unique identifier for the organization
  - `_environmentId` string, required: Unique identifier for the environment
  - `_subscriberId` string, required: Unique identifier for the subscriber
  - `_topicId` string, required: Unique identifier for the topic
  - `topicKey` string, required: Key associated with the topic
  - `externalSubscriberId` string, required: External identifier for the subscriber

## Other responses

- `400`: Bad Request
- `401`: Unauthorized
- `403`: Forbidden
- `404`: Not Found
- `405`: Method Not Allowed
- `409`: Conflict
- `413`: Payload Too Large
- `414`: URI Too Long
- `415`: Unsupported Media Type
- `422`: Unprocessable Entity
- `429`: The client has sent too many requests in a given amount of time.
- `500`: Internal Server Error
- `503`: The server is currently unable to handle the request due to a temporary overload or scheduled maintenance, which will likely be alleviated after some delay.

---

[API](https://skmtc.dev/notifly/apis/notifly-api.md) · [All operations](https://skmtc.dev/notifly/apis/notifly-api/llms.txt) · [OpenAPI document](https://skmtc.dev/notifly/apis/notifly-api/revisions/af909b9e1e57?raw)