Create External Account

Create and register a new external bank account for a specific customer.

Functionality:

• Registers a new external bank account that can be used for fiat withdrawals
• Supports multiple bank networks: US Fedwire, US ACH, and SWIFT international wires
• Automatically assigns a unique external_account_id upon successful creation

Idempotency & Duplicate Detection:

• Required: Include an Idempotency-Key header with a unique UUID for each new account creation