With the Checkout API there isn’t a way to avoid the customer information. The digital cards that the companies are issuing you are they being used for recurring payments? If so have you looked at saving the card on file with the Cards API and then using the Payments API to charge them?
Also if you’re looking to build a very simple solution for employees to input payments you can use the Web Payments SDK. The SDK doesn’t require any additional information other then the card information. 