--- title: "Connect AddEvent to fastbill - APIANT.ai" description: "When \"New Calendar\" fires in AddEvent, your agent runs \"Add Payment for Invoice\" in fastbill." canonical: "https://apiant.ai/connect/addevent-to-fastbill" --- # Connect AddEvent to fastbill When **New Calendar** fires in [AddEvent](https://apiant.ai/connections/addevent), your agent runs **Add Payment for Invoice** in [fastbill](https://apiant.ai/connections/fastbill). Describe the whole flow and it is built, tested on every scenario and kept running. AddEvent **4** triggers AddEvent **13** actions fastbill **18** actions What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it. ## What do you want AddEvent and fastbill to do together? Give your AI client this address. `https://mcp.apiant.ai` One connection does both: ask your client to act in an app once, or have it build an automation that keeps running. Any client that takes a remote MCP server. Nothing to install. Create your free account, then sign in once in your browser. ### Set it up in your client ### Claude Code Run this in the directory you want to work in. `claude mcp add --transport http -s project apiant-ai https://mcp.apiant.ai` Start Claude Code there, approve the server, and sign in in the browser page it opens. [Claude Code guide (opens in a new tab)](https://apiant.ai/docs/mcp/claude-code) ### Claude, web and desktop Open Customize, then Connectors, then Add custom connector, and paste the address. On Team and Enterprise an owner adds it first. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Cursor Add the address to your MCP configuration as a server URL. Cursor signs you in in your browser. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Zed Open Settings, then AI, then MCP Servers, then Add Server, then Add Remote Server. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Codex and the ChatGPT desktop app Open Settings, then MCP servers, then Add server, and choose Streamable HTTP. From the terminal, Codex takes the address with its own add command and then signs you in. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Any other MCP client Paste the address where the client asks for a remote MCP server URL, and name the server apiant-ai where it lets you. APIANT's skills reach the client over the same connection. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) Example flows ## What AddEvent can start in fastbill - When **New Calendar** in AddEvent then **Add Payment for Invoice** in fastbill - When **New Calendar Subscriber** in AddEvent then **Create Customer** in fastbill Starting points drawn from the triggers and actions in the catalog today. Describe the flow you need, at any depth, and your agent builds it and tests every scenario before it ships. Everything your agent can do with AddEvent and fastbill ## Triggers and actions 4 triggers · 31 actions - Trigger **New Calendar** Triggers when a new calendar is created in AddEvent. - Trigger **New Calendar Subscriber** Triggers when someone subscribes to an AddEvent calendar. - Trigger **New Event** Triggers when a new event is created in AddEvent. - Trigger **New RSVP Attendee** Triggers when a new attendee RSVPs to an AddEvent event. - Action **Create Calendar** Creates a new AddEvent calendar. - Action **Create Event** Creates an event on an AddEvent calendar and returns it with its add-to-calendar links. - Action **Create RSVP Attendee** Adds an RSVP attendee to an AddEvent event. - Action **Delete Calendar** Permanently deletes an AddEvent calendar. - Action **Delete Event** Permanently deletes an AddEvent event. - Action **Delete RSVP Attendee** Deletes an RSVP attendee. - Action **Get Calendar** Returns one AddEvent calendar by its ID. - Action **Get Event** Returns one AddEvent event by its ID. - Action **Get RSVP Attendee** Returns one RSVP attendee by ID. - Action **List Calendars** Returns the calendars on the AddEvent account. - Action **Update Calendar** Updates an AddEvent calendar; only the fields you fill in change. - Action **Update Event** Updates an AddEvent event; only the fields you fill in change. - Action **Update RSVP Attendee** Updates an RSVP attendee's email or response. - Action **Add Payment for Invoice** Adds full payment for invoice - Action **Add Payment for Revenue** Adds full payment for revenue - Action **Create Customer** Creates a new customer in FastBill - Action **Create Invoice** Creates a new invoice - Action **Create Offer** Creates a new offer in FastBill - Action **Create Revenue** Creates a revenue entry - Action **Delete Customer** Delete a FastBill customer by ID. - Action **Delete Invoice** Delete a FastBill invoice by ID. - Action **Delete Offer** Delete a FastBill offer/estimate by ID. - Action **Finalize Invoice** Converts an invoice draft to a final invoice - Action **Get Customer** Fetch a single FastBill customer by ID. - Action **Get Invoice** Fetch a single FastBill invoice by ID. - Action **Get Offer** Fetch a single FastBill offer/estimate by ID. - Action **Search Customer** Search for a Customer - Action **Search Invoice** Find an invoice - Action **Send Invoice by Email** Send an invoice by email - Action **Update Customer** Update fields on an existing FastBill customer. - Action **Update Invoice** Update fields on an existing (draft) FastBill invoice. ## Each app on its own - [ **AddEvent** AddEvent is an add to calendar service on the internet.](https://apiant.ai/connections/addevent) - [ **fastbill** FastBill is a cloud app for German invoicing & accounting.](https://apiant.ai/connections/fastbill) Reviews ## What our customers say ## More from AddEvent - [ **AddEvent to HubSpot** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/addevent-to-hubspot) - [ **AddEvent to Salesforce** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/addevent-to-salesforce) - [ **AddEvent to Slack** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/addevent-to-slack) - [ **AddEvent to Google Sheets** Google Sheets is Google's online spreadsheet app for creating, editing and sharing spreadsheets.](https://apiant.ai/connect/addevent-to-google-sheets) - [ **AddEvent to Gmail** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/addevent-to-gmail) - [ **AddEvent to Google Calendar** Google Calendar is a time management tool providing scheduling features, event reminders, and integration...](https://apiant.ai/connect/addevent-to-google-calendar) ## More into fastbill - [ **FreeAgent to fastbill** FreeAgent is cloud accounting software for small businesses and freelancers — manage contacts, invoices...](https://apiant.ai/connect/freeagent-to-fastbill) - [ **HubSpot to fastbill** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/hubspot-to-fastbill) - [ **Salesforce to fastbill** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/salesforce-to-fastbill) - [ **Slack to fastbill** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/slack-to-fastbill) - [ **Google Sheets to fastbill** Google Sheets is Google's online spreadsheet app for creating, editing and sharing spreadsheets.](https://apiant.ai/connect/google-sheets-to-fastbill) - [ **Gmail to fastbill** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/gmail-to-fastbill) Questions ## AddEvent and fastbill, answered ### ### What can start an automation from AddEvent? Any of AddEvent's 4 triggers in the catalog, including New Calendar, New Calendar Subscriber, New Event and New RSVP Attendee. Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in fastbill when something happens in AddEvent? Any of fastbill's 18 actions, including Create Customer, Create Invoice, Create Offer and Create Revenue. Your agent maps the data both ways and tests every scenario before it ships. ### ### Can it also run from fastbill to AddEvent? fastbill has no triggers in the catalog today, so automations start in AddEvent. If you need the other direction, ask: your agent reads fastbill's API documentation and adds it. ### ### Do I have to build a connector for AddEvent or fastbill? No. Both are in the catalog with their triggers and actions. You describe the automation; your agent builds it, tests every scenario and keeps it running. ### ### Can my AI client use AddEvent and fastbill without building an automation? Yes. With your AI client connected to APIANT, ask it to do something in either app once and it runs that action on the spot. Ask for an automation and your agent builds it, tests every scenario and keeps it running. One connection covers both. ### ### What happens when something fails? Your agent works that out for you. It plans the failure paths along with the happy path, then tests every scenario before it ships. ### ### Is there a free plan? Yes. Every plan includes the agent, including free, and building from your own AI client spends no assistant credits.