Stripe payment shoul go back to processing instead of failed
We found that sometimes Stripe send twice the succeeded event for a payment. The problem is that the second times, as the payment is already succeeded, Tryton set it first to failed and back to succeeded. This is to ensure that the clearing moves are up to date with the new amounts.
The problem comes if you plug some workflow on the failure of a payment (like canceling an order etc.).
I think we should not use the failed state to update succeeded payment but we should go back to processing.