Declined transactions are not caught

[JamesRamm]

• longclaw version: 0.2.0
• Django version: 1.10
• Python version: 3.5

Description

Transactions which are declined by the payment gateway (in this case braintree - unknown if it occurs with all gateways) still appear as orders in the longclaw admin:

The braintree admin however, indicates that this transaction was declined by the customers bank account due to insufficient funds. This is apparently not the same as a rejection:

https://articles.braintreepayments.com/control-panel/transactions/declines

It is more than likely that more advanced handling of different potential transaction states & statuses is required

[alexfromvl]

Hi. It is possible for these options should make your type of error in which to intercept the response from the system and displayed in the operator window. For these payments need their own type of status is payment error.

[JamesRamm]

Pushing back to 1.1 as this is more specific to braintree and I am prioritizing stripe support first.