Undecided on a bridal shower

If you are not having a shower, don't include anything about it. Not all weddings have bridal showers. Include a link to your registry on your website or if you don't share one, people will gift cash.

It's Ok not to have a shower, but I wouldn't put a registry card in the formal invitation. That's against etiquette. It's not polite to refer to gifts at all on the invitation. Usually close family passes the registry info word of mouth. It's also OK to post the information on a wedding website.

Showers are optional events. You would not tell people you aren't having a shower any more than you'd tell someone they aren't invited to something. There is no proper mention of gifts on or in an wedding invitation (even "no gifts, BTW") since you aren't supposed to even be thinking in those terms. These days, people can easily look up bridal registries on their own, ask someone close to you, or refer to a simple website link with no additional editorial commentary.