Crash while processing payments leads to unexpected behavior

[project-concerto]

Context

Assuming some user is paying with store credits, if the application crashes during processing payments, the order has some unexpected behavior after the application restarts.

Unexpected Behavior 1

If the user resumes checkout by going to /checkout, he cannot proceed and spree prompts "no payment found".

Unexpected Behavior 2

If the user adds another item to cart and click checkout, his credit won't be deducted for the initial item.

Possible Cause

After crash, the initial checkout's payment won't be re-processed.

Thus for [Unexpected Behavior 1], there is no payment to process. For [Unexpected behavior 2] only payment for newly added item will be processed.

Steps to Reproduce

We can use the following code which adds a exit to simulate a application crash:
project-concerto@144b35f

Your Environment

• Version used: master
• Gemfile and Gemfile.lock as text in a Gist: just the provided sandbox application
• Any relevant stack traces ("Full trace" preferred): None