> Paypal receivables account has no overdraft protection and not overdraft allowance. If a withdrawl over the value of the account comes in, it is denied.

Note that this may not work everywhere in the world. For example, in Australia, the legacy direct debit system will happily put an account with no overdraft into negative balance.

I’m not sure if the modern replacement (PayTo) has the same behaviour. In any case, legacy direct debits will probably stick around for years.

The best option is to simply avoid PayPal.