Service example

orders_charge_service.rb

class OrdersChargeService
  attr_accessor :user

  def initialize(user)
    @user = user
  end

  def charge_order_to_user(amount, discount, products)
    create_order(amount, discount, products)
    send_order_charge

    # ...
  end

  private

  def create_order(amount, discount, products)
    @order = Order.create!(amount: amount, discount: discount, products: products, user: user)
  end

  def send_order_charge
    # logic related to payment process, usually calling an external API
  end

  # ...
end