Blakewy

Hello, New to building out sites and have a question I can't figure out. I appreciate your folks help in advance. Looking for a way to solve the following on a squarespace site (using plugins or 3rd party app is okay if necessary) : When a customer books a service of ours (whether online, via phone or in person) I need to be able to generate a unique username and password for them that gives them access to a gated customer portal. Once in the portal, our clients invoice is dependent upon many unique factors so most often quotes are completely different from client to client, so I'd need to be able pre-populate their back end customer portal with a specified amount they owe unique to them. Lastly, we accept deposits to reserve the service date... so it'd also be ideal to accept partial payment and then have remaining balance available to pay at their leisure. Hope this makes sense. We have the business plan and the site is already connected with stripe and PayPal to accept payments. Thanks