What is the proper etiquette and wording when asking for RSVPs via a website and phone number on an invitation. Our invitation is big enough that we can fit all the information without a problem. Can we just say "RSVP on or before the date by visiting name.com/rsvp or 000-000-0000"?

These days you can put on whatever you like really, but yeah if you want to do it by email than that sounds fine. You may want tot put an address on there too because some people like to be old fashioned and sent acceptance cards which are also lovely to keep.

Just wanted to add, it would seem better to put the phone number before the website. Most people will probably call especially older people and you don't want to make it seem like you would rather they go to a website than call you.