Card payments to seed vendors are sometimes blocked by banks, and the merchant name on the statement is not always discreet. Crypto, bank transfer, and cash by post remain common for that reason, each with its own risks if a package goes missing. The vendor comparison on https://potentthcseeds.com lists accepted payment methods and notes which ones the vendor will actually refund on a lost order. Sending cash internationally with no tracking is still the option I would avoid.