@spec create(Zazu.Client.t(), map()) ::
  {:ok, Zazu.Response.t()} | {:error, Exception.t()}

Calls POST /api/customers.

@spec delete(Zazu.Client.t(), String.t()) ::
  {:ok, Zazu.Response.t()} | {:error, Exception.t()}

Calls DELETE /api/customers/:id.

@spec get(Zazu.Client.t(), String.t()) ::
  {:ok, Zazu.Response.t()} | {:error, Exception.t()}

Calls GET /api/customers/:id.

@spec list(
  Zazu.Client.t(),
  keyword()
) :: {:ok, Zazu.Page.t()} | {:error, Exception.t()}

Calls GET /api/customers.

Options

• :q — matches company name, person name, email.
• :limit — page size (1..100, default 100).
• :cursor — pagination cursor.

@spec update(Zazu.Client.t(), String.t(), map()) ::
  {:ok, Zazu.Response.t()} | {:error, Exception.t()}

Calls PATCH /api/customers/:id.