I have until the 30th of June. I really ought to broach the subject with my gestoría. Although for some reason the form Medium sent me only went up to November. As December was the only month with meaningful earnings, I'm not sure I'll bother with 4 months of bugger all from 2023. 2024 will require some solution, though.

Do they track Stripe payments? Could I get paid via Gibraltar, perhaps? Or Panama?

I just see the Spanish tax system being perplexed by the whole concept of the Medium Partner Program and how to define it.