Squarespace does not currently support PayPal's pay later services.
Squarespace did support PayPal's pay later services in early 2021 but they have since removed support for Pay in 4 (PI4) and Pay in 3 (PI3) presumably to encourage wider use of Afterpay/Clearpay.
We're waiting for Squarespace to replace the old "classic" PayPal integration with the newest "PayPal Commerce Platform" integration that supports PayPal's Pay Later suite of consumer financing solutions, but it seems unlikely this will happen in 2022.
(Post updated in April 2022)
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