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# Membership creation security enhancement

As a security precaution, creating a membership through the API now requires
the organization to have **Restrict new users to emails from these domains**
enabled. The new member's email address must belong to one of the organization's
verified domains.

Membership creation now supports API key authentication in addition to OAuth.

See the [Membership API](https://developer.close.com/api/resources/memberships/create) for details.