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How to automatically add a (free) product to a user’s cart when they visit through a referral link?

READ FIRST: This code needs to be added at the end of the functions.php file. If you are familiar with editing functions.php, feel free to continue reading. If you haven’t done this before, adding this code in the wrong place might bring the site down and the only way to access it is by editing functions.php file again via FTP. Feel free to contact us if you need help!

Let’s say you want to reward users coming through a referral link by giving them a free product. In order to do so, copy this code to the theme functions.php file and change $product_id = 64 to your product ID. 

add_action( 'gens_raf_auto_apply_coupon', 'gens_add_product_to_cart' );
function gens_add_product_to_cart() {
		if(!isset($_COOKIE["gens_raf"])) {
			return false;
		}
		$product_id = 64;
		$found = false;
		//check if product already in cart
		if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
			foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
				$_product = $values['data'];
				if ( $_product->id == $product_id )
					$found = true;
			}
			// if product not found, add it
			if ( ! $found )
				WC()->cart->add_to_cart( $product_id );
		} else {
			// if no products in cart, add it
			WC()->cart->add_to_cart( $product_id );
		}
}

Once you add this code, every user that comes through referral link will get that product added to their cart.

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I bought and tested the plugin with WooCommerce Subscription and it works like a charm. I had some specific questions to the developer and he responded very fast and helped me. I suggest the plugin!

Refer a Friend PREMIUM
@rinpocse91

If your looking to set up a referral program on your WooCommerce site to boost up your site sale “Refer A Friend for WooCommerce by WPGens” is your plugin to go for. Little blown away with an amazing support provided from (Goran) the plugin working exactly what you want to set up a referral system. Good job guys!

Refer a Friend PREMIUM
@samroon007

We deal with dozens of applications and plugins on a daily basis. Many of them are excellent, but few have truly excellent support. The Refer A Friend plugin is one of them: the response to my questions is always fast, friendly and very helpful.

Refer a Friend PREMIUM
@smartDIYer

This plugin is awesome. It looks good, it’s light weight, has great support – everything you can expect from a paid plugin, only it’s free!!!!

Swifty Bar
@ofirbeigel

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