> ## Documentation Index
> Fetch the complete documentation index at: https://www.plain.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Add customers to tenants

> Add a customer to one or more tenants in a single call.

You can add a customer to multiple tenants.

<Snippet file="graphql/sdk-note.mdx" />

When selecting the customer you can chose how to identify them. You can use the customer's email, externalId or id.

This operation requires the following permissions:

* `customer:edit`
* `customerTenantMembership:create`

<Snippet file="graphql/add-customer-to-tenants.mdx" />


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.