Yesterday I made a booking for SNA with budget , not linked to an account. When trying to do online check-in on budget.com, the site asks for a Danish drivers license. I was not able to change this to something else. I could use the rate code on the reservation to find the low pricing directly on budget.com, but only when choosing Denmark as residence.
The reservation confirmation also mentions:
This reservation was made using a corporate BCD (Budget Customer Discount Code) that requires validation of eligibility. Please be prepared to produce your company ID, business card, or a recent email with the company’s email domain (e.g. @xyzcompany.com) for employment verification purposes when picking up your vehicle.
Avis had more or less the same pricing. I made a second booking with Avis, linked to my account. This one seems fine, however it is priced in Danish kroner. No problem for me to pay DKK instead of USD but usually these reservations are priced in local currency. I wonder what would happen if I get a paid upgrade.