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Billing.

Plans, add-ons, Stripe, and crypto.

Premium is $4.99/month or $53.89/year. Black is $8.99/month or $97.09/year. Annual is 10% off.

Card billing uses Stripe. Crypto unlocks a period and then must be renewed. Payments are not anonymous.

Stripe customer data is separate from the public mailbox identity. ZanonMail stores mapping IDs, not card numbers.