Depends on the client, if their website is already A2P compliant, then it's easy and you can submit as is. If they have everything else, but just missing the opt-in language on their contact form, I'd see if they can update the contact form. It's usually easy enough for them to just update themselves and can be done in a couple of minutes. If they are missing a lot (no privacy policy or terms of service, no legal business name, no opt-in language, etc.) Then I'd just register a domain name (similar to their current domain name) and create a quick landing page in GHL that's A2P compliant, then submit that for verification. Chances are, if they're missing a lot, they probably aren't very tech savvy, so asking for DNS and website access will be a pain. You basically have to do everything yourself for non-technical clients.