TaxCloud SOAP error post-checkout

-- url of the page with the problem -- : www.weareecs.com/shop
-- HikaShop version -- : 2.6.1
-- Joomla version -- : 3.4.8

I'm not sure if I need to engage Hikashop, Taxcloud, or both.

Out of nowhere, beginning apparently this morning, we're getting an API error post-checkout rather than a confirmation screen.

Our orders ARE going through, but we're seeing duplicate orders because of the error.

This appears to be a TaxCloud problem, as nothing has been changed on the Hikashop or Joomla side, but we've had to take our store offline as a result.

A screenshot of the error is attached.

Who do we need to engage to get this resolved? We're completely offline until we can get it fixed.

Resolved. This was a problem on the TaxCloud side which likely affected all Hikashop installs, but should now be resolved.

(TaxCloud, if you're reading this, thanks for the excellent support on a holiday weekend)

Thanks - there was a namespace conflict for a few hours (for soap implementations). The issue is detailed on our status site ( status.taxcloud.net ).
Thank you.