Thanks to Spongie in the comments for the heads up

Iran wants to recover debts owed by buyers of its oil not in USD but in euros

  • Is billing new crude sales in euros too
  • Reuters reports on a source at state-owned National Iranian Oil Co (NIOC) saying:
  • "In our invoices we mention a clause that buyers of our oil will have to pay in euros, considering the exchange rate versus the dollar around the time of delivery"

Reuters