Need help in verifying GBP using a postcard or phone verification instead of video verification

Hello everyone, glad to be part of this forum.

I got a client who is a tourist operator and how the business works is they should book on the website and they could come to the beach/sea were the their operators/captain will be ready with the yacht

The client registered address is faraway from this, and they wanted to verify this business on GBP

So need your help in verifying using a post card or phone number hack removed link

Thanks in advance