@Asus > For your question. Is best to have B verified his Paypal account before the transaction took place because unverified account
has funds acceptance limit. And yes at times when the transaction amount is high, Paypal will do a security routine checking by asking
A and B to provide proof of identity verification to prevent funds laundering. Choose Personal Payments as it charges the lowest fees
and A can either choose to bear or not to bear the fees as compare to Online Purchase, it charges a 4% fees in regardless.
@lala01 > Yes you definitely can remove your CC and add in your M2U debit card. The process is imediate but Paypal will need
you to go over the verification process once again whenever you add in new CC/Debit Card. Usually to get the verification code,
you can call in your CC/Debit Card customer service to request it instead of waiting for the statement although I am not sure about
Maybank, as am using Public Bank cards all the while as back then Maybank cards is not supported for Paypal
As for withdrawal, you still can withdraw the funds as it will transfer directly to your bank account not your CC/Debit Card anymore.
Hope this helps.

3- 5 working days I think...3 days for me when using public bank debit card but I haven't tried maybank one yet.