Connect Guesty and fastbill to power AI-driven automation

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Choose a Trigger

Choose an Action

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Zapier makes it easy to integrate Guesty with fastbill - no code necessary. See how you can get setup in minutes.

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1. Choose trigger event

2. Choose action

1. Select the event

Setup

Test

App

Trigger event

Choose a trigger event

Choose a trigger

A trigger is the event that starts your Zap—like a "New or Updated Reservation" from Guesty.

Add your action

An action happens after the trigger—such as "Add Payment for Invoice" in fastbill.

You’re connected!

Zapier seamlessly connects Guesty and fastbill, automating your workflow.

Supported triggers and actions

Zapier helps you create workflows that connect your apps to automate repetitive tasks. A trigger is an event that starts a workflow, and an action is an event a Zap performs.

- Event Type
  Required
Trigger
Instant
Try It
New Invoice
Triggers when a new invoice was created within your FastBill account.
Trigger
Polling
Try It
New Offer
Triggers when a new offer was created within your FastBill account.
Trigger
Polling
Try It
- Revenue Id
  Required
- Payment Date
Action
Write
- Description
- Quantity
- Single Item Price
- VAT Rate
- Article Number
- Customer Id
  Required
- Currency Code
- Document Template
- Invoice Title
- Invoice Date
- Service Period
- Gross Prices
- State
  Required
- Service Period Start
- Service Period End
Action
Write

- Customer Id
  Required
- Offer Date
- Offer Title
- Document Template
- Currency Code
- Gross Prices
- Description
- Quantity
- Single Item Price
- VAT Rate
- Article Number
Action
Write
- Invoice Id
  Required
- Email Address
  Required
- Email Subject
- Email Body
Action
Write

- Invoice ID
- Invoice Number
Action
Search

New Draft
Triggers when a new draft was created within your FastBill account.
Trigger
Polling
Try It
Invoice Paid
Triggers when a new invoice was paid within your FastBill account.
Trigger
Polling
Try It
- Invoice Id
  Required
- Payment Date
- Payment Method
Action
Write
- Customer Number
- Company Name
- First Name
- Last Name
- Salutation
- Address Line 1
- Address Line 2
- Zip Code
- City
- Country Code
- Secondary Address
- Phone
- Email
- Website
- Customer Account
- Vat Id
Action
Write
- Invoice Id
  Required
Action
Write
- Customer Id
  Required
- Revenue date
  Required
- Due Date
- Invoice Number
- Net Amount
  Required
- Vat Amount
- Currency
- Vat Case
- Comment
Action
Write
- Customer Id
- Customer Number
- E-MAIL
Action
Search
- Customer Id
- Customer Number
- Email
- Company Name
- First Name
- Last Name
- Salutation
- Address Line 1
- Address Line 2
- Zip Code
- City
- Country Code
- Secondary Address
- Phone
- Website
- Customer Account
- Vat Id
Action
Search or write

For AI agents & developers

Use Guesty and fastbill with AI agents and code

Beyond Zap workflows. Call Guesty and fastbill actions directly from your AI client or your codebase, using the same 9,000+ app integrations Zapier already runs.

No code

Connect via Zapier MCP

Expose Guesty and fastbill actions as tools in any MCP client. Authenticate once, then call them in natural language.

Example actions on this page

Add Payment for Invoice

Works with

Claude · ChatGPT · Cursor · any MCP-compatible client

Connect Zapier MCP

Typescript

Call from code with the Zapier SDK

Trigger Guesty and fastbill actions from backend services, scripts, or agent code.

Install

# TypeScript / Node
npm install @zapier/zapier-sdk

Run an action

import { createZapierSdk } from '@zapier/zapier-sdk';

const zapier = createZapierSdk();
await zapier.runAction({ /* guesty / fastbill action */ });

Run the SDK docs

There is no Python package yet. SDK is TypeScript-only (@zapier/zapier-sdk). The MCP server URL is personal to your account; get it at zapier.com/mcp.

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Customers who say using Zapier has made them better at their job

25m

Customers have created over 25 million Zaps on the platform

6 mins

The average user takes less than 6 minutes to set up a Zap

Connect Guesty and fastbill to integrate crucial parts of your business

With Zapier, you can integrate everything from basic data entry to end-to-end processes. Here are some of the business-critical workflows that people automate with Zapier.

Automate your lead management and improve conversions

With Zapier, you can automate every part of your lead funnel and give yourself the best chance at converting leads. Automate everything from lead capture to outreach to reporting—and close more deals as a result.

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Measuring campaign performance across platforms can get chaotic. Plus, digging up the right metrics costs you precious time and effort. With Zapier, you can create a centralized view of your performance, skillfully manage your lists, and ensure your campaigns drive ROI across the business.

Provide world-class support with a little help from automation

Support reps can't be productive when they have to track down crucial information for every incident or ticket. With Zapier, you can automatically send your reps the context they need to resolve tickets quickly and create a seamless customer experience.

Automate your way to actionable, up-to-date data

The days of manually exporting and importing data are over. With Zapier, you can send data where it needs to go, in the format you need it—so you can centralize your data and unlock more insights.

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Your technical support team wants to focus on tech tickets rather than admin work. With Zapier, you can automate everything from ticket creation to routing to inter-team communication—eliminating friction from incident management and increasing speed to resolution.

Make work flow with AI

Level up your Guesty to fastbill integration with AI. Extract, summarize, and transform your integration data with leading AI models like OpenAI, Anthropic, and more.

Learn about AI automation

About Guesty

Guesty is an end-to-end solution that simplifies the complex operational needs of short-term rental management companies.

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Related categories

Scheduling & Booking

About fastbill

FastBill is a cloud app for German invoicing & accounting. Writing offers and invoices, paying your bills or preparing your tax return is easier than ever with FastBill.

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