Weird race condition when updating a cart before initializing payment

[HCaupert]

Hello everyone,

We're currently facing an issue with our Medusa integration. The problem arises when we:

• Update a cart by adding the user email (from anonymous users)
• Immediately call createPaymentSessions afterwards

It appears that updating the cart triggers a cart.customer_updated event, which has an associated listener. That triggers an updatePayment against the PaymentProcessor

The issue arises from a race condition; depending on its outcome, we might create the payment session before the listener has finished its processing. Since our custom payment processor cannot update sessions, each time we call updatePayment, a new PSP payment session is created.

This results in two sessions:

Session1, which is created and returned to the storefront upon calling createPaymentSessions
Session2, which is created but lost once the listener finishes its processing

Although it's difficult to reproduce and somewhat of an edge case, it's proving to be a significant annoyance, and we simply cannot ignore it any longer 😢

Any help/info/advice would be supper appreciated, thanks alot !