Add Basic Pay Later Buttons

[agedd]

Summary of changes

• Add a basic Pay Later button to the existing payment button stack, following the same pattern as the PayPal and Venmo buttons.

AI Usage

Which AI Agent Was Used?

• Copilot
• Claude
• Other (Type Name Here)

How was AI used?
brainstorming and cleanup

Estimated AI Code Contribution

• less than 30%
• 30 - 60%
• 60 - 100%

Checklist

• [ ] Added a changelog entry
• Tested and confirmed payment flows affected by this change are functioning as expected

Authors

List GitHub usernames for everyone who contributed to this pull request.

• @agedd

[buzzamus]

Looks good! Just some minor nit on a typo and a general question

[buzzamus]

Is this to ensure that offerPayLater is always true when passing in to use the button?

[agedd]

yes i believe the button needs offerPayLater to be true so it sets that on the request before starting checkout. the @_spi(BraintreeUIComponents) is mostly to allow BraintreeUIComponents to set this property without adding it to the public API for merchants.

[buzzamus]

I am guessing you had the same thoughts as me, but I don't necessarily like this, but I think it is better than breaking the pattern and creating the PayPalCheckoutRequest privately, so I think this makes sense given the pros and cons

[buzzamus]

Looks good!