mutation AddCustomerToAccounts($input: AddCustomerToAccountsInput!) {
  addCustomerToAccounts(input: $input) {
    customer {
      id
      externalId
      fullName
      shortName
      email {
        email
        isVerified
        verifiedAt {
          __typename
        }
      }
      avatarUrl
    }
    error {
      message
      type
      code
      fields {
        field
        message
        type
      }
    }
  }
}

{
  "input": {
    "customerIdentifier": {},
    "accountIdentifiers": [
      {}
    ]
  }
}

{
  "data": {
    "addCustomerToAccounts": {
      "customer": {
        "id": "id",
        "externalId": "id",
        "fullName": "string",
        "shortName": "string",
        "email": {
          "email": "string",
          "isVerified": true,
          "verifiedAt": {
            "__typename": "DateTime"
          }
        },
        "avatarUrl": "string"
      },
      "error": {
        "message": "string",
        "type": "VALIDATION",
        "code": "string",
        "fields": [
          {
            "field": "string",
            "message": "string",
            "type": "VALIDATION"
          }
        ]
      }
    }
  }
}