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

If you just look into class-wc-checkout.php file at line number 935 you will see that there is an action woocommerce_checkout_order_processed which pass $order_id as an argument.

So this should work for you:

add_action('woocommerce_checkout_order_processed', 'wh_pre_paymentcall');

function wh_pre_paymentcall($order_id) {

    //create an order instance
    $order = wc_get_order($order_id);
    //$payment_method = $order->payment_method_title;
    //$status = $order->get_status();

    // write your custom logic over here.
}

Code goes in functions.php file of your active child theme (or theme). Or also in any plugin php files.

Related Question: WooCommerce Get Order Product Details Before Payment in Plugin (also read the comments)

Hope this helps!

Answer 2

You can use a custom function hooked in woocommerce_checkout_order_processed action hook.
Since woocommerce 3.0+ version, here Is the corresponding core code located in process_checkout() function.

// Since WooCommerce version 3.0+
do_action( 'woocommerce_checkout_order_processed', $order_id, $posted_data, $order );

and below WooCommerce 3.0 version:

// Since WooCommerce version 2.1+ (before version 3.0+)
do_action( 'woocommerce_checkout_order_processed', $order_id, $this->posted );

So there is 2 cases depending which version of woocommerce you are using:

Since WooCommerce 3.0+ you can use 2 additional arguments in your hooked function and you will not need to create an instance of the order object as you get $order already as an argument.
You will be able also to access the posted data directly through $posted_data argument.

add_action('woocommerce_checkout_order_processed', 'action_checkout_order_processed', 10, 3);
function action_checkout_order_processed( $order_id, $posted_data, $order ) {
   // Do something
}

Since WooCommerce 2.1+ (Before WooCommerce 3.0), you have only the $order_id as argument, so you might be need to get an instance of $order object with wc_get_order() function:

add_action('woocommerce_checkout_order_processed', 'action_checkout_order_processed', 10, 1);
function action_checkout_order_processed( $order_id ) {
   // get an instance of the order object
   $order = wc_get_order( $order_id );

   // Do something
}

The Code goes in function.php file of your active child theme (or theme) or also in any plugin file.

Answer 3

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