Receipts of purchases

That sounds suspiciously like a bogus message. See the info below for info.

• Apple does not send such messages. 
• Apple does not include document, or PDF files to download.
• Apple would not refer to you as Dear Customer, Dear Client, or anything other than the name on file for your account.
• Apple would not have such horrible spelling or grammar. 
• Apple would not send a message to “Undisclosed Recipients”. 

It is a phishing attempt. Do not respond. Do not divulge any personal or financial information. You can use the address below to forward the suspect email message, as an attachment to Apple.

reportphishing@apple.com

The link below has information to help identify fraudulent emails.

https://support.apple.com/en-us/HT204759

I'm not sure I understand, but receipts normally arrive by email. Did you receive one you weren't expecting?