I’m not able to answer that question for QuickFile, but as they don’t actually store or process card data directly (all done via third party), I believe they’re not required to be.
We don’t provide the hosting mechanism for processing card payments, we also never touch or store any card details on our system. For that reason we are not PCI compliant.
Even for our own payments we are not required to be PCI compliant as we don’t have a merchant ID nor do we directly process card data. I have verified this with SecurityMetrics and Worldpay.