Get the order ID in checkout page before payment process

Question

In WooCommerce, I need to get order ID right in checkout page of WooCoommerce, before payment, when the order is created.

Answer 1

so unfortunately you cannot access the order_id on the checkout page itself because the order has not been created yet. Though this is true, the cart data is temporarily saved as a 'session' as WooCommerce calls it. this may help you a bit with your issue with passing information to an iFrame if you can tweak it a bit.

The way you can do this is by getting the information from the WC_session:

$cart_data = WC()->session->get('cart');

Once you do that, you will be able to access the cart data hierarchy as stored by WooCommerce by using a key index such as 'product_id' :

$cart_data[array_keys($cart_data)[0]]['product_id'];

Here is the list of valid cart data keys:

key
product_id
variation_id
variation (Array)
quantity
data_hash
line_tax_data (Array)
line_subtotal
line_subtotal_tax
line_total
line_tax