What to write in the actionField field in the purchase action in Yandex.Metrica ecommerce?

Question

Yandex.Metrica

Good afternoon.
I'm setting up ecommerce for Yandex.Metrica, I look at the instructions and don't understand what I should write in the actionField field in the purchase action. I take it this is the order number? But I don't have an order number in the cart yet, can I just write down some guid there? Or what's the best way to do it?
What does this phrase actually mean:

The actionField field does not pass data. To send information about the purchase, you must fill in the actionField field.

Thanks for answers.

Answer 1

Well, purchase is not a basket. This is a purchase, transaction, payment. Call it whatever you like.
And yes, you need to pass the order ID.
All steps in the cart are sent by the checkout event