Where to buy PayPal USD?

I'm seeking clarification on a matter related to cryptocurrency and finance. Could you please elaborate on the best approach to purchasing PayPal USD? I understand that PayPal is a widely used platform for online transactions, but I'm unclear about the specifics of acquiring USD through their services. I'm particularly interested in understanding the most secure and efficient methods for this process. Could you recommend any trusted exchanges or platforms that facilitate the purchase of PayPal USD? Additionally, are there any specific steps or requirements that I need to fulfill before making such a transaction? Your expertise in this field would be greatly appreciated.