# Memberships

Use these operations to manage user membership within your organizations.
Membership describes the relationship between organizations and users.
For example, one user could be a member of more than one organization.

## Retrieve memberships

 - [GET /memberships](https://www.rebilly.com/static/_spec/catalog/all-3.0/memberships/getmembershipcollection.md): Retrieves a list of organization memberships.

## Retrieve a membership

 - [GET /memberships/{organizationId}/{userId}](https://www.rebilly.com/static/_spec/catalog/all-3.0/memberships/getmembership.md): Retrieves a membership with a specified organization ID and user ID.

## Upsert membership

 - [PUT /memberships/{organizationId}/{userId}](https://www.rebilly.com/static/_spec/catalog/all-3.0/memberships/putmembership.md): Creates or updates (upserts) a membership with a specified organization ID and user ID.
Only the organization owner can grant organization membership to new users.

## Delete a membership

 - [DELETE /memberships/{organizationId}/{userId}](https://www.rebilly.com/static/_spec/catalog/all-3.0/memberships/deletemembership.md): Deletes a membership with a specified organization ID and user ID.