Project Templates API: Create milestone

Endpoint#

Property	Value
Type	mutation
Method	POST
Path	/api/external/v1/project_templates/create_milestone
Handler	OperatelyWeb.Api.ProjectTemplates.CreateMilestone

Authentication#

• Requires a valid API token.
• Requires a write-enabled token.
• Read-only tokens return 403.

Inputs#

Field	Type	Required	Nullable	Default
template_id	id primitive (encoded as string)	Yes	No	-
title	string	Yes	No	-
description	json primitive (encoded as string)	No	Yes	-
due_offset_days	integer	No	Yes	-

Outputs#

Field	Type	Required	Nullable
milestone	project_template_milestone object	Yes	No

cURL Example#

Copied

curl --request POST \
  --url "https://app.operately.com/api/external/v1/project_templates/create_milestone" \
  --header "Authorization: Bearer ${OPERATELY_API_TOKEN}" \
  --header "Content-Type: application/json" \
  --data '{"description":"value", "due_offset_days":123, "template_id":"value", "title":"value"}'

Response Example#

{
  "milestone": {
    "__typename": "value",
    "description": "value",
    "due_offset_days": 123,
    "id": "value",
    "inserted_at": "2026-01-01T09:30:00Z",
    "project_template_id": "value",
    "tasks_kanban_state": "value",
    "tasks_ordering_state": [
      "value"
    ],
    "title": "value",
    "updated_at": "2026-01-01T09:30:00Z"
  }
}