Hello @Hokyung1121,
Welcome to the PayPal Community, that's a great question! The text you received is a part of our Security System. From time to time, you may receive a notification like this to confirm you are the one completing the payment. If you're ever concerned about a text, email or website may not be PayPal, here's a great resource All about fake emails or websites .
Have a great day!
- Jon K
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