Create an entity bank account

Add a new bank account for the specified entity.

The minimum required fields are currency and country. Other required fields depend on the currency:

• EUR accounts require iban.
• GBP accounts require account_holder_name, account_number, and sort_code.
• USD accounts require account_holder_name, account_number, and routing_number.
• Accounts in other currencies require one of:
  • iban
  • account_number and sort_code
  • account_number and routing_number