How to use webflow logic to update the data in the cms item when a webhook is received

Hello webflow friends) This is my first time working with webflow logic.

I have such a task, with one flow, when sending data from a form, a cms item is created and the data from the form is entered into specific fields.

And the second flow is as follows, upon successful payment stripe webhook sends data to the incoming webhook to the second flow, and it is necessary that the data sent by stripe fit into empty fields. I understand that I need to update the data in the cms item.

But how can I make the data update in the cms item that was created at the beginning?

You can enter the id of the item, but the task is to collect data from the purchase, so the id will change dynamically. How can I implement this?