---
title: "Changes to Sign the prepared W-9 (business)"
method: POST
path: "/compliance/kyb/w9/sign"
---

# Changes to Sign the prepared W-9 (business)

`POST /compliance/kyb/w9/sign`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 3 of 43 revisions.

- **2026-09-15** `587024638dad` — 2 breaking, 1 warning, 1 info
- **2026-09-12** `322de176ce60` — 1 info
- **2026-09-10** `994a8ae9d5d8` — 1 info

## Changes

- **2026-09-15** `587024638dad` — 2 breaking, 1 warning, 1 info
  - added the new required request property `signer_date`
  - the `signer_name` request property's minLength was increased from `0` to `1`
  - the `signer_name` request property's maxLength was set to `75`
  - added the new optional request property `tax_classification_other`
- **2026-09-12** `322de176ce60` — 1 info
  - added the non-success response with the status `409`
- **2026-09-10** `994a8ae9d5d8` — 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/stablesea/apis/stable-sea-backend/docs/compliance/kyb/w9/sign/post.md) · [API](https://skmtc.dev/stablesea/apis/stable-sea-backend.md) · [Page](https://skmtc.dev/stablesea/apis/stable-sea-backend/changes/compliance/kyb/w9/sign/post)