--- title: "Connect Buttondown to fastbill - APIANT.ai" description: "When \"New Draft\" fires in Buttondown, your agent runs \"Add Payment for Invoice\" in fastbill." canonical: "https://apiant.ai/connect/buttondown-to-fastbill" --- # Connect Buttondown to fastbill When **New Draft** fires in [Buttondown](https://apiant.ai/connections/buttondown), 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. Buttondown **4** triggers Buttondown **29** 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 Buttondown 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 Buttondown can start in fastbill - When **New Draft** in Buttondown then **Add Payment for Invoice** in fastbill - When **New Scheduled Email** in Buttondown then **Send Invoice by Email** 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 Buttondown and fastbill ## Triggers and actions 4 triggers · 47 actions - Trigger **New Draft** Triggers when a new draft is created. - Trigger **New Scheduled Email** Triggers when a new email is scheduled. - Trigger **Newsletters** Triggers when a new newsletter is created. - Trigger **New Tag** Triggers when a new tag is created. - Action **Add Segment** Create a new subscriber segment. - Action **Add Survey** Create a new survey. - Action **Create Draft** Creates a draft. - Action **Create Email** Creates an email. - Action **Create Subscriber** Creates a subscriber. - Action **Delete Automation** Delete an automation by id. - Action **Delete Email** Delete an email by id. - Action **Delete Newsletter** Delete a newsletter by id. - Action **Delete Segment** Delete a subscriber segment by id. - Action **Delete Subscriber** Remove a subscriber by id or email address. - Action **Delete Survey** Delete a survey by id. - Action **Delete Tag** Delete a tag by id. - Action **Find Tag** Finds a tag given its name. - Action **Get Automation** Retrieve a single automation by id. - Action **Get Email** Retrieve a single email by id. - Action **Get Newsletter** Retrieve a single newsletter by id. - Action **Get Segment** Retrieve a single subscriber segment by id. - Action **Get Survey** Retrieve a single survey by id. - Action **Get Tag** Retrieve a single tag by id. - Action **List Automations** List all automations configured on the account. - Action **List Segments** List all subscriber segments. - Action **List Surveys** List all surveys on the account. - Action **Publish Email** Publish a drafted email so it is sent and made public. - Action **Update Automation** Update an automation's configuration. - Action **Update Email** Update an existing email's content or metadata. - Action **Update Newsletter** Update a newsletter's settings. - Action **Update Segment** Update a subscriber segment's definition. - Action **Update Survey** Update a survey's configuration. - Action **Update Tag** Update a tag's name or metadata. - 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 - [ **Buttondown** Buttondown is an easy way to start and grow your newsletter.](https://apiant.ai/connections/buttondown) - [ **fastbill** FastBill is a cloud app for German invoicing & accounting.](https://apiant.ai/connections/fastbill) Reviews ## What our customers say ## More from Buttondown - [ **Buttondown to HelloSalut** HelloSalut returns the word for "hello" in a visitor's own language.](https://apiant.ai/connect/buttondown-to-hellosalut) - [ **Buttondown to Zoho Campaigns** Zoho Campaigns lets you send email and social media campaigns to your subscribers.](https://apiant.ai/connect/buttondown-to-zoho-campaigns) - [ **Buttondown to HubSpot** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/buttondown-to-hubspot) - [ **Buttondown to Salesforce** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/buttondown-to-salesforce) - [ **Buttondown to Slack** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/buttondown-to-slack) - [ **Buttondown to Google Sheets** Google Sheets is Google's online spreadsheet app for creating, editing and sharing spreadsheets.](https://apiant.ai/connect/buttondown-to-google-sheets) ## 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 ## Buttondown and fastbill, answered ### ### What can start an automation from Buttondown? Any of Buttondown's 4 triggers in the catalog, including New Draft, New Scheduled Email, New Tag and Newsletters. Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in fastbill when something happens in Buttondown? 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 Buttondown? fastbill has no triggers in the catalog today, so automations start in Buttondown. 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 Buttondown 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 Buttondown 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.