# Reactivate a membership

`POST /v1/organizations/{org_id}/memberships/{membership_id}:reactivate` · permission `organizations:write`

Reactivates a suspended membership; the organization and the user must be active. Reactivating an active membership writes nothing. The write is audited as `organization_membership.updated` with `change=reactivated`.

## Request

| Field | Type | Required | Description |
|---|---|---|---|
| `org_id` | path | yes | Organization ID (`org_…`). |
| `membership_id` | path | yes | Membership ID (`mem_…`). |
| `If-Match` | header | no | Current `ETag`; if given it must match (`412`) and pins the write to that version. |

No request body.

## Response

`200 OK` with the updated membership and its `ETag`.

```json
{
  "id": "mem_01j9xn5p9s0t4v6w8x0y2z4a6c",
  "organization_id": "org_01j9xk3m7q8r2s4t6v8w0y2z4a",
  "user_id": "usr_01j9xh2k6p7q1r3s5t7v9w1x3y",
  "status": "active",
  "source": "admin_api",
  "reason": null,
  "roles": [
    {
      "role_id": "rol_01j9xr7s1t2w6x8y0z2a4b6c8e",
      "source": "admin_api",
      "assigned_at": "2026-10-12T09:31:00.123456Z"
    }
  ],
  "expires_at": null,
  "created_at": "2026-10-12T09:31:00.123456Z",
  "activated_at": "2026-10-12T09:31:00.123456Z",
  "suspended_at": null,
  "removed_at": null,
  "updated_at": "2026-10-12T10:00:00Z",
  "version": 3
}
```

## Errors

| HTTP | code | When |
|---|---|---|
| 404 | `not_found` | The membership does not exist in this organization. |
| 409 | `organization_disabled` | The organization is disabled. |
| 409 | `user_not_active` | The user is not active. |
| 412 | `precondition_failed` | `If-Match` does not match the current version. |
| 422 | `validation_failed` | The membership is not suspended (`/status invalid_state`). |
| 401 | `unauthenticated` | The credential is missing, invalid or revoked. |
| 403 | `insufficient_permissions` | The credential lacks the required permission. |
| 429 | `rate_limited` | The rate limit was exceeded; retry after the `Retry-After` period. |
| 503 | `service_unavailable` | A dependency is temporarily unavailable; retry after the `Retry-After` period. |

## Example

```bash
curl -i -X POST "https://api.eu.keenauth.com/v1/organizations/org_01j9xk3m7q8r2s4t6v8w0y2z4a/memberships/mem_01j9xn5p9s0t4v6w8x0y2z4a6c:reactivate" \
  -H "Authorization: Bearer $KEENAUTH_SECRET_KEY"
```

## Personal data

This endpoint carries personal data: organization memberships and invitations. [Personal data in the KeenAuth APIs](/docs/policies/personal-data) describes what is stored, how long it is kept and how it is deleted. Do not send special categories of personal data (health, biometric data, religion, political opinions, sexual orientation) in any field.