Get coupon data from WooCommerce orders

Update 3

Since WooCommerce 3.7, you should now use the WC_Abstract method get_coupon_codes() on the WC_Order instance object to get the used coupons from an order, as get_used_coupons() method is deprecated.

So you will replace in the code:

foreach( $order->get_used_coupons() as $coupon_code ){

by:

foreach( $order->get_coupon_codes() as $coupon_code ){

Then you can get coupon details like:

foreach( $order->get_coupon_codes() as $coupon_code ) {
    // Get the WC_Coupon object
    $coupon = new WC_Coupon($coupon_code);

    $discount_type = $coupon->get_discount_type(); // Get coupon discount type
    $coupon_amount = $coupon->get_amount(); // Get coupon amount
}

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Update 2

First you can’t access anymore WC objects properties since WooCommerce 3.

You should now use WC_Coupon getter methods to get coupon details from the WC_Coupon Object instance…

In your case you have to use get_discount_type() method or is_type( 'cash_back_fixed' ) method …

Here is the way to do it:

// Get an instance of WC_Order object
$order = wc_get_order( $order_id );

// Coupons used in the order LOOP (as they can be multiple)
foreach( $order->get_used_coupons() as $coupon_code ){

    // Retrieving the coupon ID
    $coupon_post_obj = get_page_by_title($coupon_code, OBJECT, 'shop_coupon');
    $coupon_id       = $coupon_post_obj->ID;

    // Get an instance of WC_Coupon object in an array(necessary to use WC_Coupon methods)
    $coupon = new WC_Coupon($coupon_id);

    // Now you can get type in your condition
    if ( $coupon->get_discount_type() == 'cash_back_percentage' ){
        // Get the coupon object amount
        $coupon_amount1 = $coupon->get_amount();
    }

    // Or use this other conditional method for coupon type
    if( $coupon->is_type( 'cash_back_fixed' ) ){
        // Get the coupon object amount
        $coupon_amount2 = $coupon->get_amount();
    }
}

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To get the coupons discount amounts (and to use also coupons types methods) here is the way:

$order = wc_get_order( $order_id );

// GET THE ORDER COUPON ITEMS
$order_items = $order->get_items('coupon');

// print_r($order_items); // For testing

// LOOP THROUGH ORDER COUPON ITEMS
foreach( $order_items as $item_id => $item ){

    // Retrieving the coupon ID reference
    $coupon_post_obj = get_page_by_title( $item->get_name(), OBJECT, 'shop_coupon' );
    $coupon_id = $coupon_post_obj->ID;

    // Get an instance of WC_Coupon object (necessary to use WC_Coupon methods)
    $coupon = new WC_Coupon($coupon_id);

    ## Filtering with your coupon custom types
    if( $coupon->is_type( 'cash_back_fixed' ) || $coupon->is_type( 'cash_back_percentage' ) ){

        // Get the Coupon discount amounts in the order
        $order_discount_amount = wc_get_order_item_meta( $item_id, 'discount_amount', true );
        $order_discount_tax_amount = wc_get_order_item_meta( $item_id, 'discount_amount_tax', true );

        ## Or get the coupon amount object
        $coupons_amount = $coupons->get_amount();
    }
}

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So to get the coupon price, we use the WC_Coupon get_amount() method