Validation - Refund payment

-- HikaShop version -- : 3.3.0
-- HikaMarket version -- : 2.0.1
-- Joomla version -- : 3.8.5
-- PHP version -- : 7.1.0
-- Browser(s) name and version -- : CHROME
-- Error-message(debug-mod must be tuned on) -- : Validation - Refund

Hello,

I just would like 2 confirmations or correction/additional information:

1. Any validation before the payment from the vendor to the buyer is not possible except by custom dev right ?
Example: Before being redirect to the payment via Paypal (adaptive) during the checkout, the vendor receive an email and has to click a button to valid the order created for the buyer to continue and pay. This way the vendor confirm that the product is really available.

2. Refund - Inspired by this topic:
www.hikashop.com/support/forum/23-market...hained-payments.html
“But as paypal said, you can use parallel mode if you want...At this moment the customer can see the different vendors.”
I (as the website) should give the responsibility to the vendor to refund via his Paypal interface by sending directly the money to the buyer ? On my side (website), I refund the commission.
Is this approach correct ? In other term: There is no refund payment via Hikashop-market, just the status change in the order...

Regards,