The fake "Sainsbury Gift Card PayPal" email invoice below, which claims recipients sent a payment to Sainsbury's eGift Card, is a scam. The fake email is being sent by scammers attempting to trick their potential victims into calling them at the fake PayPal customers service telephone number (+44 203 787 9991). If contacted, the scammers will claim they will reverse the so-called payment, but will only take their potential victims' personal and financial information, which they will use fraudulently.
The Sainsbury Gift Card PayPal Scam

From: service@paypal.com
Hello, Hello, PayPal user You've Sent $699.99 to Sainsbury's eGift Card. Call +44 203 787 9991 to reverse a transfer.
Email: contact@Sainsbury.com.
Here is your invoice.
If you have been tricked into disclosing your credit card or other financial information by the Sainsbury Gift Card PayPal scam, please contact your bank for help.