BankTransaction type is missing the batchPayment object. #776

SDK you're using (please complete the following information):

• Version 13.3.0

Describe the bug
The BankTransaction type is missing the entire batchPayment object when using the getBankTransactions function call. v9.3.0 of Xero's OpenAPI specs does include it:
https://github.com/XeroAPI/Xero-OpenAPI/blob/948a97af41332381f63e5a99148b83d644f09f27/xero_accounting.yaml#L1281

Edit: To be clear, both the value and the Type are missing. The API sends the BatchPayment object, but this library does not map it.