Woocommerce, save order before redirecting

I created my own page “Checkout”. Here I prepare the cart and via the URL I send the contents of the cart to a completely different page, where the customer even makes a purchase. It works flawlessly.
I need to save the order before redirecting. No customer data. Only order number + cart contents. This is information just for me.
Thank you for your help.

• This topic was modified 4 years, 6 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Everything else WordPress topic