Upgrade to Magento 2.4.7-p3 error in PaymentServicesPaypal module

[d-kochnov-optimus]

Preconditions and environment

Magento version: 2.4.7-p3
After upgrading from Magento 2.4.7 to 2.4.7-p3 and from PaymentServicesPaypal module 2.4.3 to 2.9.0

Steps to reproduce

Place order using the REST API /V1/guest-carts/:cartId/order.

Expected result

Order successfully placed.

Actual result

Error:

str_starts_with(): Argument #1 ($haystack) must be of type string, null given
/home/budsies/website/vendor/magento/module-payment-services-paypal/Plugin/OrderUpdate.php

Additional information

The plugin tries to get a quote payment method ($quote->getPayment()->getMethod()) while the payment is not set for the quote yet because it sent in the CartManagementInterface::placeOrder second paymentMethod argument.

Compared with placing an order from the Magento Frontend, the GuestPaymentInformationManagement::savePaymentInformationAndPlaceOrder method is used, which saves the payment into the quote before the CartManagementInterface::placeOrder method is called (without the second paymentMethod argument).

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @d-kochnov-optimus. Thank you for your report.
To speed up processing of this issue, make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce.

• For more details, review the Magento Contributor Assistant documentation.
• Add a comment to assign the issue: @magento I am working on this
• To learn more about issue processing workflow, refer to the Code Contributions.

---

Join Magento Community Engineering Slack and ask your questions in #github channel.
⚠️ According to the Magento Contribution requirements, all issues must go through the Community Contributions Triage process. Community Contributions Triage is a public meeting.
🕙 You can find the schedule on the Magento Community Calendar page.
📞 The triage of issues happens in the queue order. If you want to speed up the delivery of your contribution, join the Community Contributions Triage session to discuss the appropriate ticket.