Adding item to cart via API does not apply custom price set

[Lex-Weeks]

Summary

When you add an item to a cart via the API, if you specify a price with the item, the cart does not honor the price you supplied.

Examples

Steps to reproduce:

1. Have a logged in user
2. Get their cart id
3. Add an item to their cart via the API
4. When adding the item specify a price that is different than the catalog price
5. Go to the users cart, the price will not be the specified price.

Proposed solution

No response

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 @Lex-Weeks. 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. To deploy vanilla Magento instance on our environment, Add a comment to the issue:

• @magento give me 2.4-develop instance - upcoming 2.4.x release
• 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.

[m2-assistant]

Hi @engcom-Bravo. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).
• 2. Verify that issue has a meaningful description and provides enough information to reproduce the issue.
• 3. Add Area: XXXXX label to the ticket, indicating the functional areas it may be related to.
• 4. Verify that the issue is reproducible on 2.4-develop branch
  Details

  - Add the comment @magento give me 2.4-develop instance to deploy test instance on Magento infrastructure.
  - If the issue is reproducible on 2.4-develop branch, please, add the label Reproduced on 2.4.x.
  - If the issue is not reproducible, add your comment that issue is not reproducible and close the issue and stop verification process here!
• 5. Add label Issue: Confirmed once verification is complete.
• 6. Make sure that automatic system confirms that report has been added to the backlog.

[engcom-Bravo]

@magento give me 2.4-develop instance

[magento-deployment-service]

Hi @engcom-Bravo. Thank you for your request. I'm working on Magento instance for you.

[magento-deployment-service]

Hi @engcom-Bravo, here is your Magento Instance: https://1c05d0cc8d4428e93f005ab0da3dd2d5.instances-prod.magento-community.engineering
Admin access: https://1c05d0cc8d4428e93f005ab0da3dd2d5.instances-prod.magento-community.engineering/admin_5c44
Login: fc2aa57f
Password: 1e95eb4fd2b4

[engcom-Bravo]

Hi @Lex-Weeks,

Thanks for your reporting and collaboration.

AS per the Magento devdocs https://developer.adobe.com/commerce/webapi/rest/tutorials/orders/order-add-items/ the payload will be without price field if we are adding the price field we are getting Decoding Error.

It seems to be an expected behaviour of Magento.

Hence we are considering this as a improvement and marking this as feature request.

Thanks.

[Lex-Weeks]

It seems there may be a comma missing after price, which would be causing the decoding error.
As per the documentation PUT carts/{cartId}/items/{itemId} does accept price as a parameter.