> For a complete page index, fetch https://developer.close.com/llms.txt

# Disallow Membership creation via API Keys

We have updated the [Membership API](https://developer.close.com/api/resources/memberships/bulk-update) so requests using
[API keys](/api/overview/api-key-authentication) are no longer allowed to create memberships.

It remains possible to create memberships using
[OAuth](/api/overview/oauth-authentication).