Integrate Deftform with FastBill 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.
Deftform
When this happens...
FastBill
Automatically do this!
Create Customer
Create Invoice
Add Payment for Invoice
Send Invoice by Email
Create Revenue
Add Payment for Revenue
Create Offer
Search Customer
Search Invoice
Canceling an Invoice
List Forms from Deftform when New Offer in FastBill
Use this flowList Forms from Deftform when New Customer in FastBill
Use this flowList Forms from Deftform when Customer Updated in FastBill
Use this flowList Forms from Deftform when Customer Deleted in FastBill
Use this flowList Forms from Deftform when New Invoice in FastBill
Use this flowList Forms from Deftform when Invoice Completed in FastBill
Use this flowList Forms from Deftform when Invoice Canceled in FastBill
Use this flowList Forms from Deftform when Offer Updated in FastBill
Use this flowList Forms from Deftform when New Contact in FastBill
Use this flowList Forms from Deftform when Contact Updated in FastBill
Use this flowEverything you can automate between Deftform and FastBill.
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 Deftform integrations.
Retrieve all forms and their fields.
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.

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.

Discover viaSocket, an AI-powered workflow automation platform with 2,300+ integrations. Learn what it is, how it works, and how to set up no-code automated workflows.

Five practical automation hacks to cut repetitive tasks and boost productivity using viaSocket, covering lead generation, onboarding, accounting, support, and HR.

Explore workflow automation: its definition, benefits, how it works, real-world examples, and how to automate with viaSocket.

Discover what webhooks are, how they work, and when to use them. Compare push-based webhooks with APIs and polling, with practical examples and ViaSocket integration.
viaSocket Support
We're here to help
Instant answers
AI assistant available 24/7
Expert support
Connect with our specialists
Trusted & secure
Your data is safe with us
No credit card required. Set up your first workflow in minutes.
Deftform is an online form builder for creating and managing customizable forms, surveys, and data-collection workflows.
Learn moreFastBill 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 moreSign up for a free viaSocket account, then authorize both your Deftform and FastBill 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 Deftform and FastBill 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 FastBill. No coding required.
Yes. You can set up a workflow where Deftform triggers actions in FastBill, and a separate workflow where FastBill triggers actions in Deftform. 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 Deftform and FastBill. Paid plans unlock higher task limits, faster polling, and advanced features like multi-step workflows and conditional logic.
No. The entire Deftform and FastBill integration is built through a visual, point-and-click interface. Code blocks are available if you want them, but they are never required.