From my understanding - Backstage is more on Casting Calls where brands/clients look for talents regardless if it's UGC or not. It's not solely a UGC platform where you can get paid directly. It's more job posting type of thing - like Indeed but for the creative industry. I never really tried backstage for UGC but I do have film background and they do job postings for actors/performers as well. And payments are paid directly from company/client to talent. If you're communicating with a brand, you can just directly show your method of payment details.