@Angie76
Too late - it's long gone, and won't be coming back!
The reality is, the Group Payment feature was never about making it easier for guests to pay - in these days of instant money transfers, guests can easily send money to the main booking guest in moments. No need whatsoever for Airbnb to insert themselves in the middle of that process.
The real reason the Group Payment feature was introduced, was simply to skyrocket the new guest acquisition figures, in the run-up to the IPO (on a booking with 10 guests for example, all 10 guests would have to sign up as Airbnb members, rather than just the 1 booking guest). The plan backfired badly though, due to a huge number of bookings failing/being aborted as a result of one or two members of booking groups not providing payment in time, malfunctioning verification processes (the true reason for the 72hr window on this policy), or simply not wanting to sign up as an Airbnb member themselves.
From Day 1, it was always a disaster waiting to happen. Just another of the plethora of ill-conceived and abysmally-implemented policies that Airbnb never thinks through before foisting on their exasperated hosts. Now consigned to the scrapheap of Sh*te Airbnb Policies and Practices forever, along with all the other preposterous "initiatives" that have had to be quietly shelved.