Saw this on a facebook ad. Adds 1gb of data to your account.
Also seems like WINTER23 code from last deal for extra $2 credit is still active as shows up as a pop-up on their homepage
More codes from comments (source: https://www.mydealz.de/deals/roamless-data-esim-fur-47-lande…)
Expired codes:
LOVE24
QUENTIN24
WINTER23
Seems you also get the $3 referral credit as well?