curl --request POST \
  --url https://api.phrase.com/v2/projects/{project_id}/keys/{id}/key_links \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "child_key_ids": [
    "child_key_id1",
    "child_key_id2"
  ]
}'

{
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "created_by": null,
  "updated_by": null,
  "account": {
    "id": "abcd1234",
    "name": "Company Account",
    "slug": "company_account",
    "company": "My Awesome Company",
    "created_at": "2015-01-28T09:52:53Z",
    "updated_at": "2015-01-28T09:52:53Z",
    "company_logo_url": "http://assets.example.com/company_logo.png"
  },
  "parent": null,
  "children": [
    null
  ]
}