Documentation Index

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GET /mail/v2/categories_{id}

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Return a single category by its ID, scoped to your partner. Useful for confirming a category's name and description before referencing it in a send.

Endpoint and headers

GET https://email.useinsider.com/mail/v2/categories/{id}

Header

Value

Purpose

X-INS-AUTH-KEY

API token, format INS.{id}.{secret}

Authentication

Request parameter

Below is the parameter required for this request.

Parameter

Description

Data type

Required

id

The integer ID of the category.

Integer

Yes

Sample response

Below is a sample response for this request.

{
  "id": 3,
  "name": "order_confirmation",
  "description": "Post-purchase confirmations",
  "created_at": "2026-06-29T10:00:00Z"
}

Keep in mind

  • A non-positive ID returns 400 invalid_id.

  • An ID that does not exist for the partner returns 404 not_found.

For all error codes, refer to the Error Codes.