Improve handling of `refunded` invoice in invoices, invoice details and invoice export.

Currently, if an invoice is refunded:

• It’s not visible in invoice export as refunded it’s settled the amount is in +, which can lead to accounting problems.
• In invoices view you cannot distinguish refunded invoices, they say settled so it’s hard for a merchant to pick a particular invoice that may need to be refunded or view a refunded one as they’re all settled
• In the invoice details there’s no field indicating an invoice is refunded in any way
• In invoice details there’s no indicator of the refunded amount , and you can even click issue a refund on an invoice already refunded.

This is an example of an invoice detail of an already refunded invoice. This invoices view shows 3 invoices as settled, all of them refunded And most problematic of all, this is an invoice export containing reporting for refunded invoices

This issue can potentially be broken down into several issues, but for now we’ll use it as a tracker

• Add refunded invoices in invoice export and show refunded amount
• Add refunded label in invoices page view to distinguish easier refunded from settled.
• Add indicator that invoice is refunded in invoice details and don’t show issue a refund button, instead show preview a refund

Luckily we log in refunded in database, but we don’t show it in the UI, show a fix for all of these shouldn’t be that hard as @Kukks pointed out. I had an idea of introducing refunded and refunded-partial status, but Kukks was against it.

Thanks to Bas for pointing majority of these problems, I’m just logging an issue.

[rustywave]

Update from dev call 7/19: We will go with option 2 – listing all payments and pull payments

[rustywave]

@pavlenex, sorry for being MIA! i won’t be able to finish this or any others at this time. update is partway done but there are still some clarifications needed on which are the correct fields to use. i can either create a PR or push my changes to a remote branch for the next person to review.