Simulate an inbound wire transfer arriving at a customer account.

This endpoint is only available in the Sandbox environment and exists so you can fund an account end-to-end without involving a real counterparty bank. In production, incoming wires originate at the sending bank and cannot be created via the API.

The wire_instructions field must follow the FFC (For Further Credit) format FFC <correspondent>-<account_number>, where <correspondent> is your 4-character correspondent code and <account_number> is the customer's brokerage account number.