GT Extensions for FluentCart 2.8.2

The invoice editor shows the total with tax beside the form and updates it as you type. Issue the invoice from that panel, right under Save your draft. It saves your changes and issues them in one step, and refuses to issue if the total changed while saving. You no longer save the draft first.
A draft linked to a quote request shows Send proposal in the same place instead. Pick the valid-through date, and the panel saves your prices and emails the proposal for acceptance in one step.
New AI agent skills for invoices and quotes. Download them under Invoices → Automation as ZIP files for Claude Code and other agents that read SKILL.md folders. They connect through the free Site Agent plugin, save drafts freely, and ask you before issuing an invoice or emailing a customer. The ZIPs contain your site's address and no passwords.
New gtfc_agent() PHP function for trusted integrations: list, create, update, issue and email invoices, and create, prepare, send and withdraw quote proposals as the signed-in user, with the same checks as the admin screens.
A proposal that the customer already accepted can no longer be sent again.

Requires FluentCart. Invoices and the other store modules require FluentCart 1.6.4 or later. The agent skills also need the free Site Agent plugin with PHP execution on.