---
title: "Create a membership"
method: POST
path: "/api/v2/memberships"
tags: ["Memberships"]
---

# Create a membership

`POST /api/v2/memberships`

## Request

- Base URL: `https://yournation.nationbuilder.com`
- URL: `https://yournation.nationbuilder.com/api/v2/memberships`
- Auth: HTTP bearer

Creates a membership from given data

## Request body

- MembershipCreateRequest: The JSON:API top-level document shape for create requests, whose data member carries the new resource's type and attributes.
  - `data` object, required
    - `type` 'memberships', required: The JSON:API resource type of the resource being created.
    - `attributes` object: The write-only attributes of a membership.
      - `expires_on` string, date, nullable: When the membership expires.
      - `grace_period_num_time_periods` integer, nullable: Grace period to allow a signup to renew their membership after it expires.
      - `grace_period_time_period_type` 'days' | 'weeks' | 'months' | 'years' | 'null', nullable: Unit of time to measure grace period.
      - `membership_type_id` string: The ID of the membership type.
      - `signup_id` string: The ID of the signup.
      - `started_at` string, date-time, nullable: When the membership went into effect.
      - `status` 'active' | 'canceled' | 'expired' | 'grace period' | 'null', nullable: The membership status.
      - `status_reason` string, nullable: Short text explaining why the membership is at its current status.
      - `activity_author_id` string, nullable: Signup ID to be used as the author of the Activity log of this API action
      - `trigger_autoresponses` boolean, nullable: Whether updating the membership status to be "expired" or "grace period" should result in an autoresponse being sent to the member. Defaults to false.

## Response `201`

The newly created membership.

- MembershipShowResponse: The JSON:API top-level document shape for responses returning a single resource under the data member.
  - `data` object, required: A JSON:API resource identifier object, the type/id pair that uniquely identifies a single resource.
    - `id` string, required: Unique identifier of the resource.
    - `type` 'memberships', required: The JSON:API resource type.
    - `attributes` object: The read-only attributes of a membership.
      - `expires_on` string, date, nullable: When the membership expires.
      - `grace_period_num_time_periods` integer, nullable: Grace period to allow a signup to renew their membership after it expires.
      - `grace_period_time_period_type` 'days' | 'weeks' | 'months' | 'years' | 'null', nullable: Unit of time to measure grace period.
      - `membership_type_id` string: The ID of the membership type.
      - `signup_id` string: The ID of the signup.
      - `started_at` string, date-time, nullable: When the membership went into effect.
      - `status` 'active' | 'canceled' | 'expired' | 'grace period' | 'null', nullable: The membership status.
      - `status_reason` string, nullable: Short text explaining why the membership is at its current status.
      - `created_at` string, date-time
      - `suspended_at` string, date, nullable: When the membership was suspended.
      - `updated_at` string, date-time
  - `included` Resource[]: Sideloaded resources requested via the include query parameter. Each entry is a full resource object whose shape is documented under its own resource type.
    - `id` string, required: Unique identifier of the resource.
    - `type` string, required: The JSON:API resource type.
    - `attributes` object: The attributes of the resource, as documented for its resource type.
    - `relationships` object: References from this resource to other resources in the document.
  - `meta` object: Non-standard information about the document. Empty unless the endpoint has metadata to convey.

## Other responses

- `400`: The request body or query parameters are invalid, such as an unknown attribute, filter, filter operator, sort field, or sideload.
- `401`: The access token is missing, expired, or not authorized to access this resource.
- `422`: Model validations failed for the resource being created or updated. Unlike this API's other errors, validation failures are returned as a JSON:API errors document locating each invalid field.
- `429`: The access token has exceeded its request quota for the current rate-limit window.

## Changes

- **2026-11-05** `d5c88ca497ac`: 4 breaking, 1 warning, 7 info
  - added `#/components/schemas/create_request_document, subschema #2` to the request body `allOf` list
  - the request's body type changed from `object` to no type
  - the response's body type changed from `object` to no type for status `201`
  - removed the required property `data` from the response with the `201` status
  - …8 more

[Operation history](https://skmtc.dev/nationbuilder/apis/nationbuilder-v2-api/changes/api/v2/memberships/post.md)

---

[API](https://skmtc.dev/nationbuilder/apis/nationbuilder-v2-api.md) - [All operations](https://skmtc.dev/nationbuilder/apis/nationbuilder-v2-api/llms.txt) - [OpenAPI document](https://skmtc.dev/nationbuilder/apis/nationbuilder-v2-api/revisions/d5c88ca497ac?raw)