The link you followed will bring you to this page:

https://www.google.com/search?q=fac+simile+scrittura+privata+cessione+credito+superbonus&client=opera&ei=JgZ3Y7zwCrGT9u8PgeyoqAc&oq=fac+simile+scrittura+privata+cessione+credito+&gs_lcp=Cgxnd3Mtd2l6LXNlcnAQARgBMgUIABCABDIFCAAQgAQyBQgAEIAEMgUIABCABDIFCAAQgAQyBggAEBYQHjIGCAAQFhAeMgYIABAWEB4yBggAEBYQHjoKCAAQRxDWBBCwA0oECEEYAEoECEYYAFCrEVirEWCTL2gBcAF4AIABowGIAaMBkgEDMC4xmAEAoAEByAEIwAEB&sclient=gws-wiz-serp