Preview payout fees

POST https://api.balampay.com/sandbox/v1/virtual-accounts/{id}/payout/preview

Preview fees for a payout before executing it. Use this endpoint to display fee breakdown to users before they confirm.

Supports both modes:

• Fiat mode: Omit payment_instructions
• Crypto mode: Include payment_instructions with network and currency

Only supported for US_BANK virtual accounts in ACTIVE status.