Cancellation via API - Can it be done?

Menno,

I feel your pain here. I am also a vendor working on an application for a Tessitura venues and finding information can be a huge problem.

I think the answer here is that you have to log into the dashboard of the payment provider that they are currently using. This may be WindCave or WorldPay. It could possibly be Tessitura Merchant Services if they were setup very recently. 

You should be able to process refunds directly on the payment providers there.

This does not however answer your question about voiding the received tickets via the API however. I wish I could direct you to a more direct answer, but we're currently in the process of trying to implement payment processors in our clients new custom application at the moment and will be running into the same question.

You should always process refunds through Tessitura.  If you are doing it manually you can easily do this as part of the order update that releases the seats in question.  I know that you can release seats and transfer money via the API, as many people have built ticket exchange tools using the API.  These rely on money being placed "On Account" for the customer.

Processing refunds via customer initiation (if that's the goal) is fundamentally trickier: if they paid by card, do you still have the card token or order reference number?  And using the former has all sort of security considerations (many Tessitura systems are configured to not let you do anything but refund by reference).  If you don't have that number?  Or they paid by cash?

Thanks for your answer and time Gawain!
However, it's not about financial transactions. See my response to Redrik for more background.

Thanks for your answer and time Gawain!
However, it's not about financial transactions. See my response to Redrik for more background.