| `id` | integer or string | yes | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
| `issue_iid` | integer | yes | The internal ID of a project's issue |
| `target_project_id` | integer or string | yes | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) of a target project |
| `target_issue_iid` | integer or string | yes | The internal ID of a target project's issue |