PayPal Payment Buttons: Link sellers to transactions and refund help

[millerf]

Fixes WOOPTP-575

Proposed changes

• PayPal's certification checklist (Seller Experience rows 23 and 24) asks that sellers can reach their completed payments and, since nothing here refunds through the API, a page explaining how to issue a refund.
• The block's account menu gains a How to issue a refund item, linking to PayPal's help article, next to View transactions.
• The Payment Links admin page's header gets both links beside the connection badge. View transactions follows the connected environment (sandbox or production); the refund article is the same in both.
• The admin page test teardown now clears the OAuth class's static credentials cache too, so a test can render the disconnected page after a connected one.

Related product discussion/links

• WOOPTP-575, part of the certification audit in WOOPTP-569.

Does this pull request change what data or activity we track or use?

No.

Testing instructions

• Connect a site to PayPal and add a PayPal Payment Buttons block with a saved payment link.
• Open the account menu (the ⋮ next to the block name in the sidebar). It lists Customize checkout settings, View transactions, How to issue a refund, then Log out. The refund item opens https://www.paypal.com/us/cshelp/article/how-do-i-issue-a-refund-help101 in a new tab.
• Go to PayPal Payment Links in wp-admin. Next to the Connected badge there are View transactions and How to issue a refund buttons, both opening in a new tab. On a sandbox connection, View transactions goes to www.sandbox.paypal.com.
• Disconnect PayPal: the admin page shows neither link.

🤖 Generated with Claude Code

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WoA dev site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin (Jetpack), and enable the add/paypal-refund-and-transactions-links branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack add/paypal-refund-and-transactions-links

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• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[github-actions]

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Paypal Payment buttons plugin:

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[jp-launch-control]

Code Coverage Summary

Coverage changed in 2 files.

File	Coverage	Δ%	Δ Uncovered
projects/packages/paypal-payments/src/paypal-payment-buttons/class-paypal-admin-page.php	377/440 (85.68%)	0.44%	0 💚
projects/packages/paypal-payments/src/paypal-payment-buttons/components/account-header.jsx	10/10 (100.00%)	0.00%	0 💚

Full summary · PHP report · JS report