---
title: "Upload exemption certificate"
method: POST
path: "/v1/exemptions/{exemption_id}/attachments"
tags: ["Exemptions"]
---

# Upload exemption certificate

`POST /v1/exemptions/{exemption_id}/attachments`

The Upload Exemption Certificate API allows you
    to upload a file attachment (e.g., exemption certificate) for a specific exemption.
    This is primarily used to associate supporting documents with an exemption record
    to ensure compliance and facilitate verification.

## Path parameters

- `exemption_id` string, required — The unique identifier for the exemption to which the attachment will be associated.

## Headers

- `x-organization-id` string, nullable, required — The unique identifier for the organization making the request

## Response `200`

Successfully retrieved exemption by id

- AttachmentRead
  - `related_entity_id` string, required — The unique identifier of the exemption associated with the attachment.
  - `related_entity_type` 'EXEMPTION' | 'REGISTRATION' | 'FILING' | 'FILING_PAYMENT', required
  - `id` string, required — The unique identifier of the uploaded attachment (attachment ID).

## Other responses

- `401` — The request is missing a valid x-api-key or x-organization-id
- `422` — Validation issues, such as missing required fields or invalid field values.
- `500` — Internal Server Error

## Changes

- **2026-08-29** `6ba4f4c774c3` — 2 breaking, 3 info
  - added the new required `header` request parameter `x-organization-id`
  - the `file` request property contentMediaType changed from `` to `application/octet-stream`
  - the endpoint scheme security `APIKeyHeader` was added to the API
  - the endpoint scheme security `APIKeyHeader AND CustomHeader` was removed from the API
  - …1 more
  - …this revision’s changelog is incomplete

[Change history](https://skmtc.dev/trykintsugi/apis/tax-platform/changes/v1/exemptions/:exemption_id/attachments/post.md)

---

[API](https://skmtc.dev/trykintsugi/apis/tax-platform.md) · [All operations](https://skmtc.dev/trykintsugi/apis/tax-platform/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/trykintsugi/tax-platform/revisions/846cc8ce4d30/schema)