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<?php
  /**
	 * Direct Checkout on Add-to-cart
	 */
	add_filter('add_to_cart_redirect', 'yanco_add_to_cart_redirect');
	function yanco_add_to_cart_redirect() {
		global $woocommerce;
		$checkout_url = $woocommerce->cart->get_checkout_url();
		return $checkout_url;
	}