N26
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Likely one of the partners' discount codes. I was unable to find it advertised elsewhere. Used it twice over the past week for stays in April 2020 and decided to post my first deal here.
Works for me, but I'm still finding the following still cheaper…for the hotels i am looking at.
Expedia using 'MASTERAU11H' (pay with mastercard)
or
Cheaptickets using either 'FALL16' or 'SAVENOW' (priced in USD)