How to buy PayPal dollars?

Could you please elaborate on the process of purchasing PayPal dollars? Are there specific steps that need to be followed, or is it a straightforward transaction? Are there any fees associated with this type of purchase? Additionally, how does one ensure that the transaction is secure and the funds are transferred safely? Is there a limit to the amount of PayPal dollars that can be purchased at one time? Finally, are there any alternative methods to acquire PayPal dollars if the traditional route is not feasible?