---
title: "Change who pays for a client project"
method: PUT
path: "/clients/{id}/payer"
tags: ["Agencies"]
---

# Change who pays for a client project

`PUT /clients/{id}/payer`

## Request

- Base URL: `https://api.hypamoon.com/api/v1`
- URL: `https://api.hypamoon.com/api/v1/clients/{id}/payer`
- Auth: one of:
  - HTTP bearer
  - OAuth 2 (authorization code, authorization URL `https://app.hypamoon.com/oauth/authorize`, token URL `https://api.hypamoon.com/oauth/token`, scopes: `clients:write`)

Proposes who pays the usage of a client project (client or agency), or agrees to what the client proposed. It only changes when both sides agree: the client accepts in the portal under Agencies. Choosing the current payer withdraws an open proposal. In the building stage your agency decides alone; the client sees it when taking over. applied tells whether it changed now.

## Path parameters

- `id` string, uuid, required

## Request body

- object
  - `payer` 'client' | 'agency', required

## Response `200`

The relation, with payer_change while it waits for the client.

- object
  - `object` 'client_relation', required
  - `id` string, uuid, required
  - `agency` object, required
    - `project_id` string, uuid, required
    - `name` string, required
  - `client` object, required
    - `project_id` string, uuid, required
    - `name` string, required
  - `status` 'pending' | 'active' | 'declined' | 'ended', required
  - `stage` 'building' | 'client_owned', required
  - `role` 'viewer' | 'builder' | 'admin', required
  - `max_mode` 'test' | 'live', required
  - `four_eyes` boolean, required
  - `payer` 'client' | 'agency', required
  - `budget_eur` number, nullable, required
  - `payer_change` object, nullable, required
    - `to` 'client' | 'agency', required
    - `proposed_by` 'client' | 'agency', required
    - `proposed_at` string, nullable, required
  - `owner_invite` object, nullable, required
    - `email` string, required
    - `expires_at` string, nullable, required
    - `agency_keeps_access` boolean, required
  - `confirmed_at` string, nullable, required
  - `ended_at` string, nullable, required
  - `created_at` string, required
  - `transfer` object
    - `direction` 'incoming' | 'outgoing', required
    - `agency` object, required
      - `project_id` string, uuid, required
      - `name` string, required
    - `relation_id` string, uuid, required
    - `expires_at` string, nullable, required
  - `ended_via` 'client' | 'agency' | 'admin' | 'handover' | 'expired' | 'cleanup'
  - `cleanup` object
    - `phase` 'notified' | 'trash' | 'deleted', required
    - `trash_on` string, required
    - `delete_on` string, required
  - `applied` boolean, required

## Other responses

- `400`: Bad Request: invalid_json.
- `401`: Unauthorized: unauthorized, missing_api_key, invalid_api_key, api_key_revoked, project_deleted.
- `403`: Forbidden: project_not_enabled, key_mode_mismatch, missing_scope, verification_required, forbidden.
- `404`: Not Found: not_found.
- `409`: Conflict: conflict.
- `422`: Unprocessable Content: validation_failed.
- `429`: Too Many Requests: rate_limited.
- `500`: Internal Server Error: internal_error.
- `503`: Service Unavailable: service_unavailable.

---

[API](https://skmtc.dev/hypamoon/apis/hypamoon-api.md) · [All operations](https://skmtc.dev/hypamoon/apis/hypamoon-api/llms.txt) · [OpenAPI document](https://skmtc.dev/hypamoon/apis/hypamoon-api/revisions/9f0b90004c06?raw)