Hi,
I was able to take a look at your website and it looks like your issue is coming from a external plugin and as no link with HikaMarket.
If I edit the HikaShop order class and I replace
if($new) {
$send_email = $this->sendEmailAfterOrderCreation;
$dispatcher->trigger('onAfterOrderCreate', array(&$order, &$send_email));
By
if($new) {
$send_email = false;
if($order_type != 'vendorpayment') {
$send_email = $this->sendEmailAfterOrderCreation;
$dispatcher->trigger('onAfterOrderCreate', array(&$order, &$send_email));
}
I am then able to pay the vendors.
It means that, during the trigger "onAfterOrderCreate" (or in the email "order_creation_notification") ; there is an issue.
Because we cannot see anything in the log (a PHP error or a SQL error), I suppose that a plugin is performing an "exit" which stop completely the PHP processing.
So I am afraid that I cannot do anything in HikaMarket to solve that issue if it is not coming from HikaMarket.
Regards,