My Tickets doesn’t currently have any option for coupon codes or related types of sales. That’s an add-on in planning stages, but it’s not available yet.
The same is true of optional add-ons; there’s an API for custom fields on events when adding to cart (see https://github.com/joedolson/plugin-extensions/blob/master/my-tickets/custom-fields.php) and another for custom values in the cart (https://github.com/joedolson/plugin-extensions/blob/master/my-tickets/my-ticket-custom-cart-fields.php), but they aren’t connected up to the pricing UI. This would be possible, but there’s no existing add-on that does it right now.
Adding fields for address on the shopping cart page would definitely be helpful to me, but I can’t seem to figure out how to get the code from github to work. I uploaded each plugin and activated them, but can’t find any way to actually set them up. Am I missing something?
There are no settings for those plug-ins; they’re just demos of how to handle custom fields in My Tickets. You’d have to be comfortable editing PHP to be able to implement them.