Integrate FastBill with CheckFlow to automate workflows, sync data between apps, and eliminate repetitive tasks with AI-powered automation.
Start from a real workflow other teams are already running.
FastBill
When this happens...
New Offer
New Customer
Customer Updated
Customer Deleted
New Invoice
Invoice Completed
Invoice Canceled
Offer Updated
New Contact
Contact Updated
Contact Deleted
CheckFlow
Automatically do this!
Create Checklist
Share Checklist
Find Checklists
Create Checklist in CheckFlow when New Offer in FastBill
Use this flowShare Checklist from CheckFlow when New Offer in FastBill
Use this flowFind Checklists in CheckFlow when New Offer in FastBill
Use this flowCreate Checklist in CheckFlow when New Customer in FastBill
Use this flowShare Checklist from CheckFlow when New Customer in FastBill
Use this flowFind Checklists in CheckFlow when New Customer in FastBill
Use this flowCreate Checklist in CheckFlow when Customer Updated in FastBill
Use this flowShare Checklist from CheckFlow when Customer Updated in FastBill
Use this flowFind Checklists in CheckFlow when Customer Updated in FastBill
Use this flowCreate Checklist in CheckFlow when Customer Deleted in FastBill
Use this flowEverything you can automate between FastBill and CheckFlow.
When this happensTriggers
A trigger is an event that starts a workflow.
Triggers when a new offer was created within your FastBill account.
Triggers when a new customer is created within your FastBill account.
Triggers when a customer is updated within your FastBill account.
Triggers when a customer is deleted within your FastBill account.
Triggers when a new invoice is created within your FastBill account.
Triggers when an invoice is completed within your FastBill account.
Action is the task that follows automatically within your FastBill integrations.
Creates a new customer in FastBill.
Creates a new invoice.
Adds full payment for an invoice.
Send an invoice by email.
Creates a revenue entry.
Adds full payment for a revenue.

Follow a simple walkthrough to create, test, and launch your first automation.
Connect your apps
Link the apps you want to automate.
Configure your workflow
Set up triggers, actions, and map your data.
Test & publish
Test your workflow and publish it.
Recognized by leading review platforms and trusted by 10,000+ businesses worldwide.
Just describe the task in plain English. viaSocket AI selects the right apps, builds the workflow, maps the fields, and prepares everything for review before you publish.

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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.
Learn moreCheckflow is a powerful tool designed to streamline and automate your workflow processes. It helps teams manage tasks, track progress, and ensure that all steps in a process are completed efficiently. With Checkflow, you can create custom workflows, assign tasks, and monitor the status of each project in real-time, making it an essential tool for enhancing productivity and collaboration.
Learn moreSign up for a free viaSocket account, then authorize both your FastBill and CheckFlow accounts. From there, pick a trigger in one app and an action in the other. Your first workflow can be live in under five minutes.
Yes. viaSocket uses instant triggers where available, so data moves between FastBill and CheckFlow as soon as the event happens. Scheduled polling triggers run at a maximum interval of 15 minutes.
Yes. You can map specific fields, apply filters to skip records that do not match your conditions, and transform values before they reach CheckFlow. No coding required.
Yes. You can set up a workflow where FastBill triggers actions in CheckFlow, and a separate workflow where CheckFlow triggers actions in FastBill. Both run independently and in real time.
viaSocket logs every run so you can see exactly what succeeded and what failed. Failed tasks can be retried from the dashboard without re-configuring the workflow.
Yes, there is a free plan that covers basic workflows between FastBill and CheckFlow. Paid plans unlock higher task limits, faster polling, and advanced features like multi-step workflows and conditional logic.
No. The entire FastBill and CheckFlow integration is built through a visual, point-and-click interface. Code blocks are available if you want them, but they are never required.