GeoJetson

I redesigned a client's Squarespace site using a new account since they wanted to change templates and are on 7.0. The design is now approved and ready to go live. I want to make this switchover with a minimum of downtime and data loss. The client currently has: - Domain NOT registered at Squarespace - Stripe payments integration through Squarespace - Google Workspace billed through Squarespace The client needs to continue Stripe for incoming donations (it's a nonprofit) and Google Workspace for essential email and data storage. If possible, they'd also like to transfer the remainder of the paid Business account membership to the new site. What's the best way to do this?