Learn how to direct your clients to their client portal here.
It is very easy for your clients to set up. You copy and send them the invite link, and then your client creates a password and logs in.
Once logged in, The client can click on the project, and then they can see the invoices, pay, download, sign contracts, download any added image galleries, see the project info, and upload and download files in shared assets.
To pay An invoice from the client portal, your clients will have to click the Make Payment button.
It's essential to understand that creating a client portal is entirely optional. Clients can pay invoices and sign contracts without needing to log into the portal, as both contracts and invoices are sent directly to their email.