post https://api-sandbox.getdefacto.com/borrower//repayment-methods
Add and/or choose the repayment method for borrower.
If payment method is "DIRECT_DEBIT" then the `account` parameter must not be null.
If `is_default_repayment_method` is true, then the repayment method becomes the borrower's default
repayment method so that upcmoing loan requests will use this payment method and account as a default.
Please note: that the account defined in the `loan_to` attribute of created loans is left
unchanged. If you want to change the destination account of a loan, you must cancel it and
request a new loan.
If `apply_to_all_active_loans` is true, then the repayment method is used for upcoming payments of all loans that are in TO_REPAY or TO_REPAY_FEES statuses.