Fix trial payments

[hnrqer]

Warning!!! Merge this only after https://github.com/Etison/mothership/pull/10206 has been merged in master and QA accepted

Overview

The issue occurs for Recurly subscription plans with a trial period and without any setup fee.

When this happens, the response returned by Recurly API doesn't have any transactions, so in order to grab the message status and the authorization uuid, we have to process the invoice differently for this type of payment by using the line_items structure and the invoice state.

• Example of request response WITHOUT setup fee

{
  ...
  "state"=>"paid",
  "paid"=>0.0,
  "total"=>0.0,
  "subtotal"=>0.0,
  "refundable_amount"=>0.0,
  "transactions"=>[],
  "line_items"=> 
  { 
    ..., 
    "data"=>
    [
      { 
        ...
        "uuid"=>"...", 
       }
    ]
  }
}

• Example of request response WITH setup fee

{
  ...
  "state"=>"paid",
  "paid"=>10.0,
  "total"=>10.0,
  "subtotal"=>10.0,
  "refundable_amount"=>10.0,
  "transactions"=>
  [
    {
      ...,
      "id"=>"...",
    }
  ],
  "line_items"=> 
  { 
    ..., 
    "data"=>
    [
      { 
        ...
        "uuid"=>"...", 
      }
    ]
  }
}

It is possible to see the plan setup fee configuration in Recurly by visiting Configuration -> Plans and then select your plan. The section showing the setup fee configuration is this one:

Pivotal Tracker Links

https://www.pivotaltracker.com/story/show/173013712

Dependency Updates

None