Gumroad

Delivers ebooks/audiobooks/reader magnets; group promos & swaps.

UK POD with special editions (foil, ribbons) + Shopify/Payhip integration.

Tips/shop/memberships; 0% on donations, 5% on shop (free plan).

Merchant-of-record checkout (handles tax).

POD fulfillment connected to your site (keep 100% profit).

Membership/subscription for serialized fiction & bonus content.