Configure client invoice / portal on my WordPress website

Need completed right away.

I installed and setup basic Jetpack. We can use that or whatever free plugin.

From a Google search

For a free WordPress client portal plugin that handles invoices and payments, top options include Jetpack CRM, Sprout Invoices, and Sliced Invoices. These plugins offer essential invoicing features and integrate with popular payment gateways within their free versions, while some advanced features like recurring payments are often part of their premium versions.
Recommended Free Plugins
Jetpack CRM: This is a full-featured CRM for small businesses that allows you to manage clients, leads, invoices, and billing directly within WordPress. It integrates with WooCommerce and offers core invoicing capabilities in the free version.
Sprout Invoices: The free version provides solid functionality for creating estimates and invoices, managing clients, and tracking payments. It is designed for service-based businesses and allows clients to view and pay invoices online, though advanced options like recurring payments and some payment gateways may require a premium upgrade.
Sliced Invoices: This plugin is well-regarded for freelancers and small businesses due to its flexibility in creating custom quotes and invoices. The free version allows for online payments via PayPal, and additional payment processors are available as premium add-ons.
Easy Invoice (PDF Invoice Generator & Quote Builder): This free plugin is great for freelancers and agencies, allowing you to create unlimited invoices and quotes, generate PDF documents, and accept PayPal payments.