docs: @Nullable
      @BankAccountType
      public static String asBankAccountType(@Nullable String possibleAccountType) {
          if (BankAccount.TYPE_COMPANY.equals(possibleAccountType)) {
              return BankAccount.TYPE_COMPANY;
          } else if (BankAccount.TYPE_INDIVIDUAL.equals(possibleAccountType)) {
              return BankAccount.TYPE_INDIVIDUAL;
          }
  
          return null;
      }