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Default developer fee, in basis points (100 = 1%), for virtual accounts that auto-liquidate. It is only a default: it fills in developer_fee_bps when a virtual account is created, or its liquidation is updated, with a liquidation target but no fee of its own. A fee on the request, 0 included, always overrides it. It never applies to quotes or payments, to virtual accounts without auto-liquidation, or to accounts that don't accept a developer fee, and changing it does not change accounts already set up. 0 (the starting value) applies no fee.