I am interested in purchasing a RAK5146-125 mini PCIe card from your website. However, I noticed a discrepancy in the interface specifications between your site and the RAK website. While your website indicates that this card uses the SPI interface, the RAK website states that it supports the USB interface. Could you please provide clarification on this matter?
It looks like it supports the USB. Take a look at this link to the RAK web site.
RAK5146 WisLink LPWAN Concentrator Datasheet | RAKwireless Documentation Center