If paymentMethodData is null, it is assumed that the bank account details have already been attached via collectBankAccountForPayment or collectBankAccountForSetup.
collectBankAccountForPayment
collectBankAccountForSetup
Optional
Defaults to Individual
Defaults to Checking
If paymentMethodData is null, it is assumed that the bank account details have already been attached via
collectBankAccountForPayment
orcollectBankAccountForSetup
.