Order status not updating, callback failed

[Willard1975]

Hello

I'm using an old version of DiBS payment module, it was last modified in 2014 when VM3 didn't exist. After every order is paid for i get an email that a callback failed due to a 403 forbidden error on this url:
mysite.com/index.php?option=com_virtuemart&view=pluginresponse&task=pluginnotification

I can see in the logs that DiBS has done a POST to: index.php?option=com_virtuemart&view=pluginresponse&task=pluginresponsereceived
But it has status 200 OK.

The order status is waiting, it doesn't update to confirmed once the payment is completed.

I've checked a few posts on this forum and tried changing the callback url in DiBS plugin to:

index.php?option=com_virtuemart&view=vmplg&task=notify&tmpl=component
index.php?option=com_virtuemart&view=pluginresponse&task=pluginresponsereceived

But it didn't work. Does anyone have a clue what could be wrong?

/Michael

Joomla 3.5.1, VM 3.0.16

EDIT: I just checked. The version of DiBS payment plugin (4.1.7) that i'm using does support VM 3.