@type bank_transfer() :: %{
  optional(:eu_bank_transfer) => bank_transfer_eu_bank_transfer() | nil,
  optional(:requested_address_types) => [String.t()] | nil,
  optional(:type) => String.t() | nil,
  optional(String.t()) => term()
}

• eu_bank_transfer - Configuration for eu_bank_transfer funding type.
• requested_address_types - List of address types that should be returned in the financial_addresses response. If not specified, all valid types will be returned.

Permitted values include: sort_code, zengin, iban, or spei.

• type - The type of the bank_transfer Possible values: eu_bank_transfer, gb_bank_transfer, jp_bank_transfer, mx_bank_transfer, us_bank_transfer.

@type bank_transfer_eu_bank_transfer() :: %{
  optional(:country) => String.t() | nil,
  optional(String.t()) => term()
}

• country - The desired country code of the bank account information. Permitted values include: BE, DE, ES, FR, IE, or NL. Max length: 5000.

@type t() ::
  %Stripe.Params.CustomerFundingInstructionsCreateFundingInstructionsParams{
    bank_transfer: bank_transfer(),
    currency: String.t(),
    expand: [String.t()] | nil,
    funding_type: String.t()
  }

• bank_transfer - Additional parameters for bank_transfer funding types
• currency - Three-letter ISO currency code, in lowercase. Must be a supported currency. Format: ISO 4217 currency code.
• expand - Specifies which fields in the response should be expanded.
• funding_type - The funding_type to get the instructions for. Possible values: bank_transfer.