gem install kashflow

k = Kashflow.client('my_login', 'my_password')

# call the GetCustomers method
k.get_customers

# call the GetInvoices_Unpaid method
k.get_invoices_unpaid

# call a method with a parameter
k.get_customer_by_email(:customer_email => 'customer@example.com')

k.delete_invoice(:invoice_number => 5)

customers = k.get_customers
customers.each do |cust|
  next unless cust.email.ends_with?('.co.uk')

  puts "#{cust.name}: #{cust.contact} - #{cust.website}"
end