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Check that cart total is not zero before rendering express checkout #9691

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dmvrtx
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@dmvrtx dmvrtx commented Nov 8, 2024

Fixes #9687

Changes proposed in this Pull Request

  • Validate that cart amount is not zero before rendering Express Checkout Element in the non-block checkout. This prevents Express Checkout errors in case if shopper adds a coupon which grants 100% discount and free shipping.

I've discovered a few other similar code flows, but those appear to be not affected by the case of coupons, as there is nowhere to enter the coupon code, e.g. on the product page.

Testing instructions

  • Create a simple product with a value of 20.
  • Create a coupon that will discount 20 and will enable free shipping.
  • Inside a GooglePay/ApplePay compatible browser, add the product to cart, and move to checkout.
  • The express checkout button will be rendered and functional.
  • Apply the discount, and that will make the checkout total 0.
  • Express Checkout buttons should disappear after cart total is updated.
coupon applied
  • Remove the coupon.
  • Express Checkout should become available again.
coupon removed

On a separate note, if we reapply coupon, we will get an error notice "Coupon has already been applied!", but the cart update will happen as it should.


  • Run npm run changelog to add a changelog file, choose patch to leave it empty if the change is not significant. You can add multiple changelog files in one PR by running this command a few times.
  • Covered with tests (or have a good reason not to test in description ☝️)
  • Tested on mobile (or does not apply)

Post merge

@dmvrtx dmvrtx requested review from a team and gpressutto5 and removed request for a team November 8, 2024 20:57
@dmvrtx dmvrtx self-assigned this Nov 8, 2024
@botwoo
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botwoo commented Nov 8, 2024

Test the build

Option 1. Jetpack Beta

  • Install and activate Jetpack Beta.
  • Use this build by searching for PR number 9691 or branch name fix/9687-express-checkout-visible-for-zero-amount-after-coupon-discount in your-test.site/wp-admin/admin.php?page=jetpack-beta&plugin=woocommerce-payments

Option 2. Jurassic Ninja - available for logged-in A12s

🚀 Launch a JN site with this branch 🚀

ℹ️ Install this Tampermonkey script to get more options.


Build info:

  • Latest commit: fda4fbb
  • Build time: 2024-11-14 15:11:11 UTC

Note: the build is updated when a new commit is pushed to this PR.

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github-actions bot commented Nov 8, 2024

Size Change: +21 B (0%)

Total Size: 1.34 MB

Filename Size Change
release/woocommerce-payments/dist/express-checkout.js 14.8 kB +21 B (0%)
ℹ️ View Unchanged
Filename Size
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@dmvrtx dmvrtx requested a review from a team November 8, 2024 21:53
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@mgascam mgascam left a comment

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Thanks @dmvrtx. Code changes look good to me and it works as expected (tested with GPay and Chrome)
🚢

@dmvrtx dmvrtx added this pull request to the merge queue Nov 14, 2024
Merged via the queue into develop with commit 47739ad Nov 14, 2024
25 checks passed
@dmvrtx dmvrtx deleted the fix/9687-express-checkout-visible-for-zero-amount-after-coupon-discount branch November 14, 2024 15:26
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Payment Request buttons visible for zero-amount checkout if coupon is appled on the checkout page
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