Simple example of importing customers to desk.com using the API with the API wrapper gem https://github.com/tstachl/desk.

import_customers.rb

require 'desk_api'
require 'csv'

client = DeskApi::Client.new({
  username: '[email protected]', # your desk.com username
  password: 'yourpassword',    # your desk.com password
  subdomain: 'yoursubdomain'   # your desk.com subdomain (https://this.desk.com)
})

CSV.foreach('./customers.csv', headers: true) do |row|
  emails = []
  emails.push({ type: 'home', value: row['email'].strip }) if not row['email'].nil? and not row['email'].empty?
  emails.push({ type: 'work', value: row['email_2'].strip }) if not row['email_2'].nil? and not row['email_2'].empty?

  phones = []
  phones.push({ type: 'home', value: row['phone_home'].strip }) if not row['phone_home'].nil? and not row['phone_home'].empty?
  phones.push({ type: 'work', value: row['phone_work'].strip }) if not row['phone_work'].nil? and not row['phone_work'].empty?
  phones.push({ type: 'mobile', value: row['phone_mobile'].strip }) if not row['phone_mobile'].nil? and not row['phone_mobile'].empty?

  addresses = []
  addresses.push({ type: 'home', value: "#{row['street']}\n#{row['city']}, #{row['state']} #{row['zip']}" })

  # you need to setup your custom fields
  custom_fields = {}

  params = {
    first_name: (row['first_name'] || '').strip,
    last_name: (row['last_name'] || '').strip,
    emails: emails,
    phone_numbers: phones,
    addresses: addresses,
    custom_fields: custom_fields
  }

  begin
    client.customers.create params
  rescue DeskApi::Error::UnprocessableEntity
    # this means the customer already exists
  end
end