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Newsletters API

REST API endpoints for creating, sending, and managing newsletter campaigns.

Newsletters are email campaigns broadcast to your active subscribers. A newsletter starts as a draft, can be edited freely, and is sent in the background once you call the send endpoint. Its status moves through draft → sending → sent, or failed if delivery breaks down. Failed newsletters can be reset to draft and retried. Manage the subscriber list itself via the Subscribers API.

List Newsletters

GET /api/v1/newsletters

Returns newsletter campaigns, newest first.

Query Parameters

ParameterTypeDefaultDescription
limitnumber50Newsletters per page (1-100)
offsetnumber0Newsletters to skip
statusstring—Filter by status: draft, sending, sent, or failed
curl \
  -H "Authorization: Bearer your_api_key" \
  "https://your-store.yns.store/api/v1/newsletters?status=sent"

Response (200)

{
  "data": [
    {
      "id": "0191abc0-1234-7def-8000-000000000001",
      "subject": "Spring Sale — 20% off everything",
      "content": "Our spring sale is live. Use code SPRING20 at checkout.",
      "status": "sent",
      "recipientCount": 1240,
      "sentAt": "2024-06-15T12:00:00.000Z",
      "failedAt": null,
      "errorMessage": null,
      "createdAt": "2024-06-14T09:00:00.000Z",
      "updatedAt": "2024-06-15T12:00:00.000Z"
    }
  ],
  "meta": {
    "count": 1,
    "offset": 0,
    "limit": 50
  }
}

Create Newsletter

POST /api/v1/newsletters

Creates a draft campaign. Use the send endpoint to broadcast it once you're ready.

Request Body

FieldTypeRequiredDescription
subjectstringYesEmail subject line
contentstringYesPlain-text email body
curl -X POST \
  -H "Authorization: Bearer your_api_key" \
  -H "Content-Type: application/json" \
  -d '{"subject": "Spring Sale — 20% off everything", "content": "Our spring sale is live. Use code SPRING20 at checkout."}' \
  https://your-store.yns.store/api/v1/newsletters

Response (201)

{
  "id": "0191abc0-1234-7def-8000-000000000001",
  "subject": "Spring Sale — 20% off everything",
  "content": "Our spring sale is live. Use code SPRING20 at checkout.",
  "status": "draft",
  "recipientCount": 0,
  "sentAt": null,
  "failedAt": null,
  "errorMessage": null,
  "createdAt": "2024-06-14T09:00:00.000Z",
  "updatedAt": "2024-06-14T09:00:00.000Z"
}

Get Newsletter

GET /api/v1/newsletters/{id}

Returns a single newsletter by UUID, including status, recipientCount, and the sent/failed timestamps.

Response (200)

{
  "id": "0191abc0-1234-7def-8000-000000000001",
  "subject": "Spring Sale — 20% off everything",
  "content": "Our spring sale is live. Use code SPRING20 at checkout.",
  "status": "draft",
  "recipientCount": 0,
  "sentAt": null,
  "failedAt": null,
  "errorMessage": null,
  "createdAt": "2024-06-14T09:00:00.000Z",
  "updatedAt": "2024-06-14T09:00:00.000Z"
}

Not Found (404)

{
  "error": "Newsletter not found"
}

Update Newsletter

PATCH /api/v1/newsletters/{id}

Edits the subject and/or content of a draft newsletter. Only drafts can be edited — editing a newsletter in any other status returns 409.

Request Body

FieldTypeRequiredDescription
subjectstringNoEmail subject line
contentstringNoPlain-text email body
curl -X PATCH \
  -H "Authorization: Bearer your_api_key" \
  -H "Content-Type: application/json" \
  -d '{"subject": "Spring Sale — 25% off this weekend"}' \
  https://your-store.yns.store/api/v1/newsletters/0191abc0-1234-7def-8000-000000000001

Response (200)

Returns the updated newsletter.

Not a Draft (409)

{
  "error": "Only draft newsletters can be edited"
}

Delete Newsletter

DELETE /api/v1/newsletters/{id}

Deletes a draft newsletter by UUID. Only drafts can be deleted — deleting a newsletter in any other status returns 409.

curl -X DELETE \
  -H "Authorization: Bearer your_api_key" \
  https://your-store.yns.store/api/v1/newsletters/0191abc0-1234-7def-8000-000000000001

Response (200)

{
  "ok": true,
  "deleted": 1
}

Not a Draft (409)

{
  "error": "Only draft newsletters can be deleted"
}

Send Newsletter

POST /api/v1/newsletters/{id}/send

Broadcasts the draft to all active subscribers in the background. Before dispatching, YNS validates several preconditions: a verified sending email domain with outbound email enabled, a configured store address, at least one active subscriber, and remaining capacity in your monthly email quota. If any check fails the send is rejected with the appropriate status (400, 403, 404, or 409) and no emails go out.

curl -X POST \
  -H "Authorization: Bearer your_api_key" \
  https://your-store.yns.store/api/v1/newsletters/0191abc0-1234-7def-8000-000000000001/send

Response (202)

{
  "success": true,
  "recipientCount": 1240,
  "message": "Newsletter send started; emails are sending in the background."
}

Errors

StatusMeaning
400Precondition not met (email config, store address, or no active subscribers)
403Monthly email quota would be exceeded
404Newsletter not found
409Newsletter is not a draft

Retry Newsletter

POST /api/v1/newsletters/{id}/retry

Resets a failed newsletter back to draft so it can be edited and re-sent. Returns 409 if the newsletter is not in the failed status.

curl -X POST \
  -H "Authorization: Bearer your_api_key" \
  https://your-store.yns.store/api/v1/newsletters/0191abc0-1234-7def-8000-000000000001/retry

Response (200)

Returns the newsletter reset to draft status.

{
  "id": "0191abc0-1234-7def-8000-000000000001",
  "subject": "Spring Sale — 20% off everything",
  "content": "Our spring sale is live. Use code SPRING20 at checkout.",
  "status": "draft",
  "recipientCount": 0,
  "sentAt": null,
  "failedAt": null,
  "errorMessage": null,
  "createdAt": "2024-06-14T09:00:00.000Z",
  "updatedAt": "2024-06-15T13:00:00.000Z"
}

Not Failed (409)

{
  "error": "Only failed newsletters can be retried"
}
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