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+# Epic Links API **[ULTIMATE]**
+
+>**Note:**
+> This endpoint was [introduced](https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9188) in GitLab 11.8.
+
+Manages parent-child [epic relationships](../user/group/epics/index.md#multi-level-child-epics).
+
+Every API call to `epic_links` must be authenticated.
+
+If a user is not a member of a group and the group is private, a `GET` request on that group will result to a `404` status code.
+
+Epics are available only in the [Ultimate/Gold tier](https://about.gitlab.com/pricing/). If the epics feature is not available, a `403` status code will be returned.
+
+## List epics related to a given epic
+Gets all child epics of an epic.
+
+```
+GET /groups/:id/epics/:epic_iid/epics
+```
+
+| Attribute | Type | Required | Description |
+| ---------- | -------------- | -------- | ------------------------------------------------------------------------------------------------------------- |
+| `id` | integer/string | yes | The ID or [URL-encoded path of the group](README.md#namespaced-path-encoding) owned by the authenticated user |
+| `epic_iid` | integer | yes | The internal ID of the epic. |
+
+```bash
+curl --header "PRIVATE-TOKEN: <your_access_token>" https://gitlab.example.com/api/v4/groups/1/epics/5/epics/
+```
+
+Example response:
+
+```json
+[
+ {
+ "id": 29,
+ "iid": 6,
+ "group_id": 1,
+ "parent_id": 5,
+ "title": "Accusamus iste et ullam ratione voluptatem omnis debitis dolor est.",
+ "description": "Molestias dolorem eos vitae expedita impedit necessitatibus quo voluptatum.",
+ "author": {
+ "id": 10,
+ "name": "Lu Mayer",
+ "username": "kam",
+ "state": "active",
+ "avatar_url": "http://www.gravatar.com/avatar/018729e129a6f31c80a6327a30196823?s=80&d=identicon",
+ "web_url": "http://localhost:3001/kam"
+ },
+ "start_date": null,
+ "start_date_is_fixed": false,
+ "start_date_fixed": null,
+ "start_date_from_milestones": null,
+ "end_date": "2018-07-31",
+ "due_date": "2018-07-31",
+ "due_date_is_fixed": false,
+ "due_date_fixed": null,
+ "due_date_from_milestones": "2018-07-31",
+ "created_at": "2018-07-17T13:36:22.770Z",
+ "updated_at": "2018-07-18T12:22:05.239Z",
+ "labels": []
+ }
+]
+```
+
+## Assign a child epic
+
+Creates an association between two epics, designating one as the parent epic and the other as the child epic. A parent epic can have multiple child epics. If the new child epic already belonged to another epic, it is unassigned from that previous parent.
+
+```
+POST /groups/:id/epics/:epic_iid/epics
+```
+
+| Attribute | Type | Required | Description |
+| --------------- | -------------- | -------- | ------------------------------------------------------------------------------------------------------------------ |
+| `id` | integer/string | yes | The ID or [URL-encoded path of the group](README.md#namespaced-path-encoding) owned by the authenticated user |
+| `epic_iid` | integer | yes | The internal ID of the epic. |
+| `child_epic_id` | integer | yes | The global ID of the child epic. Internal ID can't be used because they can conflict with epics from other groups. |
+
+```bash
+curl --header POST "PRIVATE-TOKEN: <your_access_token>" https://gitlab.example.com/api/v4/groups/1/epics/5/epics/6
+```
+
+Example response:
+
+```json
+{
+ "id": 6,
+ "iid": 38,
+ "group_id": 1,
+ "parent_id": 5
+ "title": "Accusamus iste et ullam ratione voluptatem omnis debitis dolor est.",
+ "description": "Molestias dolorem eos vitae expedita impedit necessitatibus quo voluptatum.",
+ "author": {
+ "id": 10,
+ "name": "Lu Mayer",
+ "username": "kam",
+ "state": "active",
+ "avatar_url": "http://www.gravatar.com/avatar/018729e129a6f31c80a6327a30196823?s=80&d=identicon",
+ "web_url": "http://localhost:3001/kam"
+ },
+ "start_date": null,
+ "start_date_is_fixed": false,
+ "start_date_fixed": null,
+ "start_date_from_milestones": null,
+ "end_date": "2018-07-31",
+ "due_date": "2018-07-31",
+ "due_date_is_fixed": false,
+ "due_date_fixed": null,
+ "due_date_from_milestones": "2018-07-31",
+ "created_at": "2018-07-17T13:36:22.770Z",
+ "updated_at": "2018-07-18T12:22:05.239Z",
+ "labels": []
+}
+```
+
+## Create and assign a child epic
+
+Creates a a new epic and associates it with provided parent epic. The response is LinkedEpic object.
+
+```
+POST /groups/:id/epics/:epic_iid/epics
+```
+
+| Attribute | Type | Required | Description |
+| --------------- | -------------- | -------- | ------------------------------------------------------------------------------------------------------------------ |
+| `id` | integer/string | yes | The ID or [URL-encoded path of the group](README.md#namespaced-path-encoding) owned by the authenticated user |
+| `epic_iid` | integer | yes | The internal ID of the (future parent) epic. |
+| `title` | integer | yes | The global ID of the child epic. Internal ID can't be used because they can conflict with epics from other groups. |
+
+```bash
+curl --header POST "PRIVATE-TOKEN: <your_access_token>" https://gitlab.example.com/api/v4/groups/1/epics/5/epics?title=Newpic
+```
+
+Example response:
+
+```json
+{
+ "id": 24,
+ "iid": 2,
+ "title": "child epic",
+ "group_id": 49,
+ "parent_id": 23,
+ "has_children": false,
+ "reference": "&2",
+ "url": "http://localhost/groups/group16/-/epics/2",
+ "relation_url": "http://localhost/groups/group16/-/epics/1/links/24"
+}
+```
+
+## Re-order a child epic
+
+```
+PUT /groups/:id/epics/:epic_iid/epics/:child_epic_id
+```
+
+| Attribute | Type | Required | Description |
+| ---------------- | -------------- | -------- | ------------------------------------------------------------------------------------------------------------------ |
+| `id` | integer/string | yes | The ID or [URL-encoded path of the group](README.md#namespaced-path-encoding) owned by the authenticated user. |
+| `epic_iid` | integer | yes | The internal ID of the epic. |
+| `child_epic_id` | integer | yes | The global ID of the child epic. Internal ID can't be used because they can conflict with epics from other groups. |
+| `move_before_id` | integer | no | The global ID of a sibling epic that should be placed before the child epic. |
+| `move_after_id` | integer | no | The global ID of a sibling epic that should be placed after the child epic. |
+
+```bash
+curl --header PUT "PRIVATE-TOKEN: <your_access_token>" https://gitlab.example.com/api/v4/groups/1/epics/4/epics/5
+```
+
+Example response:
+
+```json
+[
+ {
+ "id": 29,
+ "iid": 6,
+ "group_id": 1,
+ "parent_id": 5,
+ "title": "Accusamus iste et ullam ratione voluptatem omnis debitis dolor est.",
+ "description": "Molestias dolorem eos vitae expedita impedit necessitatibus quo voluptatum.",
+ "author": {
+ "id": 10,
+ "name": "Lu Mayer",
+ "username": "kam",
+ "state": "active",
+ "avatar_url": "http://www.gravatar.com/avatar/018729e129a6f31c80a6327a30196823?s=80&d=identicon",
+ "web_url": "http://localhost:3001/kam"
+ },
+ "start_date": null,
+ "start_date_is_fixed": false,
+ "start_date_fixed": null,
+ "start_date_from_milestones": null,
+ "end_date": "2018-07-31",
+ "due_date": "2018-07-31",
+ "due_date_is_fixed": false,
+ "due_date_fixed": null,
+ "due_date_from_milestones": "2018-07-31",
+ "created_at": "2018-07-17T13:36:22.770Z",
+ "updated_at": "2018-07-18T12:22:05.239Z",
+ "labels": []
+ }
+]
+```
+
+## Unassign a child epic
+
+Unassigns a child epic from a parent epic.
+
+```
+DELETE /groups/:id/epics/:epic_iid/epics/:child_epic_id
+```
+
+| Attribute | Type | Required | Description |
+| --------------- | -------------- | -------- | ------------------------------------------------------------------------------------------------------------------ |
+| `id` | integer/string | yes | The ID or [URL-encoded path of the group](README.md#namespaced-path-encoding) owned by the authenticated user. |
+| `epic_iid` | integer | yes | The internal ID of the epic. |
+| `child_epic_id` | integer | yes | The global ID of the child epic. Internal ID can't be used because they can conflict with epics from other groups. |
+
+```bash
+curl --header DELETE "PRIVATE-TOKEN: <your_access_token>" https://gitlab.example.com/api/v4/groups/1/epics/4/epics/5
+```
+
+Example response:
+
+```json
+{
+ "id": 5,
+ "iid": 38,
+ "group_id": 1,
+ "parent_id": null,
+ "title": "Accusamus iste et ullam ratione voluptatem omnis debitis dolor est.",
+ "description": "Molestias dolorem eos vitae expedita impedit necessitatibus quo voluptatum.",
+ "author": {
+ "id": 10,
+ "name": "Lu Mayer",
+ "username": "kam",
+ "state": "active",
+ "avatar_url": "http://www.gravatar.com/avatar/018729e129a6f31c80a6327a30196823?s=80&d=identicon",
+ "web_url": "http://localhost:3001/kam"
+ },
+ "start_date": null,
+ "start_date_is_fixed": false,
+ "start_date_fixed": null,
+ "start_date_from_milestones": null,
+ "end_date": "2018-07-31",
+ "due_date": "2018-07-31",
+ "due_date_is_fixed": false,
+ "due_date_fixed": null,
+ "due_date_from_milestones": "2018-07-31",
+ "created_at": "2018-07-17T13:36:22.770Z",
+ "updated_at": "2018-07-18T12:22:05.239Z",
+ "labels": []
+}
+```