Form payments and their integrations...

For Space payments I created a form and added 3 integrations but am not sure if they are redundant or not. The User Reg Integration feed has this checkbox, if I check it, and a person is already in my wordpress users, is it only the integration that will not run, but the payment goes forward? If not how do I enable ->if user skip registration go on to payment?

I have also created a Fluent CRM integration Feed and Fluent Community integration feed, do I still to create automations then to add members to spaces or the integrations suffice?