Hello @Timbox13,
Welcome to the PayPal Community, this is a great question! Unfortunately, I'm unable to say if a specific merchant accepts Pay-in-4 or not, but I can say if you've already have the option setup, you would see it during checkout if Pay-in-4 is available. You can read a bit more about Pay-in-4 here, but I would recommend reaching out to our Customer Support if you have any further questions.
Good luck!
- Jon K
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