# Connect Saasu to fastbill When **New Contact** fires in [Saasu](https://apiant.ai/connections/saasu), 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. Saasu **1** trigger Saasu **21** 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 Saasu 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 Saasu can start in fastbill - When **New Contact** in Saasu then **Add Payment for Invoice** in fastbill - When **New Contact** in Saasu 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 Saasu and fastbill ## Triggers and actions 1 trigger · 39 actions - Trigger **New Contact** Triggers when a new contact is added to your Saasu file. - Action **Add activity** Creates an activity (task, call, meeting, note) in your Saasu file, optionally attached to a contact or transaction. - Action **Add company** Creates a company record in Saasu. - Action **Add item** Creates an inventory or combo item in Saasu. - Action **Add journal** Creates a manual journal entry with debit and credit lines in a Saasu file. - Action **Create Contact** Creates a new contact (person) in your Saasu file and returns its id. - Action **Create Item Invoice** Creates an item-layout invoice, quote or order in Saasu with inventory item line items. - Action **Create Service Invoice** Creates a service-layout sale or purchase invoice in Saasu, with line items described by account and amount. - Action **Delete contact** Deletes a contact from your Saasu file. - Action **Delete invoice** Deletes a sale or purchase invoice from the Saasu file. - Action **Delete item** Deletes an inventory item from the Saasu file. - Action **Email invoice** Emails a Saasu invoice to the email address you specify. - Action **Find accounts** Returns the accounts in your Saasu chart of accounts, filtered by type, status, bank-account flag or header account. - Action **Find companies** Returns the companies in your Saasu file whose name matches, optionally limited to a last-modified date range. - Action **Find Contact** Finds Saasu contacts matching an email, name, company or other criteria and returns the matching contacts. - Action **Find items** Returns the inventory and combo items whose code or description matches the search text. - Action **Get contact** Returns a single Saasu contact by its ID. - Action **Get invoice** Returns a single Saasu invoice (sale or purchase) by its ID, including line items and totals. - Action **Get journal** Returns a single journal transaction, including its date, reference, summary and journal line items. - Action **Update contact** Updates an existing contact in Saasu, such as their name, email, phone numbers, addresses and customer/supplier flags. - Action **Update invoice** Updates an existing Saasu sale or purchase invoice, replacing its details and line items. - Action **Update item** Updates an existing inventory or combo item in Saasu, such as its code, description, prices, accounts and tax codes. - 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 - [ **Saasu** Fast, simple online accounting for small business that includes cashflow, invoicing, inventory, payroll and...](https://apiant.ai/connections/saasu) - [ **fastbill** FastBill is a cloud app for German invoicing & accounting.](https://apiant.ai/connections/fastbill) Reviews ## What our customers say ## More from Saasu - [ **Saasu to Salesforce** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/saasu-to-salesforce) - [ **Saasu to Slack** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/saasu-to-slack) - [ **Saasu to Stripe** Stripe is a payment processing platform for online businesses.](https://apiant.ai/connect/saasu-to-stripe) - [ **Saasu to Shopify** Shopify is a commerce platform for online stores and retail point-of-sale.](https://apiant.ai/connect/saasu-to-shopify) - [ **Saasu to Trello** Trello is a visual collaboration tool that organizes projects into boards, lists, and cards.](https://apiant.ai/connect/saasu-to-trello) - [ **Saasu to Zoom** Zoom unifies cloud video conferencing, simple online meetings, group messaging, and a software-based...](https://apiant.ai/connect/saasu-to-zoom) ## 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](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 ## Saasu and fastbill, answered ### ### What can start an automation from Saasu? Any of Saasu's 1 trigger in the catalog, including New Contact. Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in fastbill when something happens in Saasu? 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 Saasu? fastbill has no triggers in the catalog today, so automations start in Saasu. 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 Saasu 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 Saasu 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.