public function apply_coupon( $coupon_code ) {
		// Coupons are globally disabled.
		if ( ! wc_coupons_enabled() ) {
			return false;
		}

		// Sanitize coupon code.
		$coupon_code = wc_format_coupon_code( $coupon_code );

		// Get the coupon.
		$the_coupon = new WC_Coupon( $coupon_code );

		// Prevent adding coupons by post ID.
		if ( $the_coupon->get_code() !== $coupon_code ) {
			$the_coupon->set_code( $coupon_code );
			$the_coupon->add_coupon_message( WC_Coupon::E_WC_COUPON_NOT_EXIST );
			return false;
		}

		// Check it can be used with cart.
		if ( ! $the_coupon->is_valid() ) {
			wc_add_notice( $the_coupon->get_error_message(), 'error' );
			return false;
		}

		// Check if applied.
		if ( $this->has_discount( $coupon_code ) ) {
			$the_coupon->add_coupon_message( WC_Coupon::E_WC_COUPON_ALREADY_APPLIED );
			return false;
		}

		// If its individual use then remove other coupons.
		if ( $the_coupon->get_individual_use() ) {
			$coupons_to_keep = apply_filters( 'woocommerce_apply_individual_use_coupon', array(), $the_coupon, $this->applied_coupons );

			foreach ( $this->applied_coupons as $applied_coupon ) {
				$keep_key = array_search( $applied_coupon, $coupons_to_keep, true );
				if ( false === $keep_key ) {
					$this->remove_coupon( $applied_coupon );
				} else {
					unset( $coupons_to_keep[ $keep_key ] );
				}
			}

			if ( ! empty( $coupons_to_keep ) ) {
				$this->applied_coupons += $coupons_to_keep;
			}
		}

		// Check to see if an individual use coupon is set.
		if ( $this->applied_coupons ) {
			foreach ( $this->applied_coupons as $code ) {
				$coupon = new WC_Coupon( $code );

				if ( $coupon->get_individual_use() && false === apply_filters( 'woocommerce_apply_with_individual_use_coupon', false, $the_coupon, $coupon, $this->applied_coupons ) ) {

					// Reject new coupon.
					$coupon->add_coupon_message( WC_Coupon::E_WC_COUPON_ALREADY_APPLIED_INDIV_USE_ONLY );

					return false;
				}
			}
		}

		$this->applied_coupons[] = $coupon_code;

		// Choose free shipping.
		if ( $the_coupon->get_free_shipping() ) {
			$packages                = WC()->shipping()->get_packages();
			$chosen_shipping_methods = WC()->session->get( 'chosen_shipping_methods' );

			foreach ( $packages as $i => $package ) {
				$chosen_shipping_methods[ $i ] = 'free_shipping';
			}

			WC()->session->set( 'chosen_shipping_methods', $chosen_shipping_methods );
		}

		$the_coupon->add_coupon_message( WC_Coupon::WC_COUPON_SUCCESS );

		do_action( 'woocommerce_applied_coupon', $coupon_code );

		return true;
	}