> This page is for Developer.

> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.bigcommerce.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.bigcommerce.com/_mcp/server.

# customerEmailCheck

GraphQL QUERY

Check if a customer email exists in BC, supports multi-storefront.  
Doesn't require a Token.

Reference: https://docs.bigcommerce.com/developer/api-reference/graphql/b2b/b2b-graphql/queries/customer-email-check

## GraphQL Schema

```graphql
query ExampleQuery($email: String!, $storeHash: String!, $channelId: Int) {
  customerEmailCheck(email: $email, storeHash: $storeHash, channelId: $channelId) {
    userType
  }
}
```

## Variables

```json
{
  "email": "example",
  "storeHash": "example",
  "channelId": null
}
```