Displaying a notice for risky Cash App transactions

[wjrosa]

Fixes #3198

Changes proposed in this Pull Request:

See: https://href.li/?https://docs.stripe.com/payments/cash-app-pay#payment-limits-and-options

Although Cash App Pay has no transaction amount limits, it may decline a high-amount transaction (i.e., 2000 USD) depending on the customer account and transaction history. This PR adds this notice to the checkout page when the cart amount reaches the threshold.

Testing instructions

• Checkout to this branch on your local environment (tweak/display-notice-for-risky-transactions-on-cash-app)
• Run npm install, npm run build:webpack and npm run up
• Connect your Stripe account (you must use a US account)
• Enable Cash App in both your store settings and the Stripe dashboard
• As a shopper, add some products to your cart (below 2000 USD)
• Confirm that no warnings are displayed
• Add more products, above the 2000 USD
• Confirm that you can see the new notice warning about the decline risk

---

• [x] Covered with tests (or have a good reason not to test in description ☝️)
• [x] Added changelog entry in both changelog.txt and readme.txt (or does not apply)
• [ ] Tested on mobile (or does not apply)

Post merge

• [ ] Added testing instructions to the Release Testing Instructions wiki page (or does not apply)

[wjrosa]

Thanks for working on this @wjrosa!

The message is displayed twice in the Shortcode Checkout

Also, can we show the message only when the customer chooses CashApp? and maybe closer or inside the payment selection box instead of a notice at the top?

Thanks for your review, Diego! I have updated the implementation per your suggestion. It is shown now above the payment selection box and only when Cash App is selected 👍

Edit: I am still working on the shortcode version 👀 . Edit 2: Now it is complete and ready for a new review.

[wjrosa]

Some updated preview images:

[wjrosa]

Cool, @diegocurbelo ! I have included all your commit suggestions and fixed some issues with them. I didn't pay attention to all those standards, but I got them now 🙌