Hi @rebeculus,
Thank you for your post! Welcome to the Community Forum!
I'm sorry to hear about the money request that you received. Your proposed solution would work if they are in your contacts list already. However, it is not possible to manually add a contact to the list, as I believe @PayPal_RachelK was saying earlier. If you need instructions for blocking someone who is already in your contacts list, please take a look at this linked Help Center Article.
I am sorry for the inconvenience and I hope this helps!
Olivia
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