capture-module.ex

defmodule Capture do
 def prepare(checkout, payment) do
   request = %{
     amount: checkout.amount,
     card_pan: payment.card_pan,
     request_id: UUID.uuid4()
   }
   {:ok, request}
 end

 def commit(checkout, request) do
   with {:ok, response} <- send_request(request) do
     if response.success do
       {:ok, %{checkout | captured_amount: response.amount}}
     else
       {:error, response.error}
     end
   end
 end
end