exemplo2solid.rb

class Subscription
  def initialize(user)
    @user = user
  end
  
  def call
    create_payment!
    create_invoice!
  rescue StandardError => e
    puts e.message
  end
  
  private
  
  attr_accessor :user, :payment

  def create_payment!
    payment_result = payment_request
    @payment = Payment.create!(user: user, amount: 30.00, status: payment_result[:status], transaction_id: payment_result[:id])
  end
  
  def payment_request
    # Requisição API/Gateway de pagamentos
  end
  
  def create_invoice!
    invoice_result = invoice_request
    Invoice.create!(payment: payment, status: invoice_result[:status], transaction_id: invoice_result[:id])
  end
  
  def invoice_request
    # Requisição API/Gateway de notas fiscais
  end
end