}

		// Record the attempt's completion.
		$attempt->end();

		// Setup a redirect.
		$url = add_query_arg(
			array(
				'attempt_key' => $attempt->get_key(),
			),
			get_permalink( $attempt->get( 'quiz_id' ) )
		);

		return array(
			/**
			 * Filter the quiz redirect URL on completion.
			 *
			 * @since Unknown
			 *
			 * @param string            $url     The quiz redirect URL on completion.
			 * @param LLMS_Quiz_Attempt $attempt The quiz attempt.
			 */
			'redirect' => apply_filters( 'llms_quiz_complete_redirect', $url, $attempt ),
		);
	}

	/**
	 * Remove a coupon from an order during checkout
	 *
	 * @since 3.0.0
	 *
	 * @param array $request $_POST data.
	 * @return array
	 */
	public static function remove_coupon_code( $request ) {

		llms()->session->set( 'llms_coupon', false );

		$plan = new LLMS_Access_Plan( $request['plan_id'] );