api.customer()

def customerId = ...

def customerId = api.customer("customerId")

def customerName = api.customer("name") //Customer Name
def customerCountry = api.customer("attribute5") //Country
def customerType = api.customer("attribute6") //Customer type

def customerId = ...

def qapi = api.queryApi()

def c = qapi.tables().customers()

def customerId = ... // Api to get customerId

def customer = qapi.source(c, [
        c.customerId(),
        c.name(),
        c.country,
        c.customer_type],
        c.customerId().equal(customerId))
        .stream {it.find() }

def customerName = customer.name
def customerCountry = customer.country
def customerType = customer.customer_type