Chase Pay with discontinue their checkout platform where select apps and websites have them available at checkout (similar to Paypal and Visa Checkout) on March 31, 2021.
In preparation for Chase Pay no longer being available for use in PayPal, learn how to add your Chase cards directly to your PayPal account.
They had already shut down the dedicated Chase Pay app around a year ago. You can pay with Chase cards via Paypal, and of course you can always add cards individually to any website.