About this integration
Online invoicing and billing software for freelancers and small businesses.
There are 1 trigger, 7 search modules and 26 actions available. The integration connects via basic authentication. Webhook-based triggers fire instantly without polling.
How to connect
The credential form asks for Email Address and API Key.
Prefer the interactive builder form? Open it on the app page.
Paste your credentials once — WEXTL® stores them encrypted and reuses the connection across every workflow that needs it.
Enter your credentials below. WEXTL stores them encrypted and uses them only to call the API on your behalf.
Connecting FastBill to WEXTL®
| Field | Type | Help |
|---|---|---|
Email AddressRequired | Your Email Address | |
API KeyRequired | password | Log in to FastBill → Settings → Generate/Copy API Key. |
Use it in workflow automation
Start with Watch Events, then add Cancel an Invoice.
The canvas below runs Watch Events into Cancel an Invoice — watch the video, then drop a node onto the canvas.
Select the Watch Events trigger and the workflow fires automatically when the event occurs — no polling required.
Then add Create a Contact as the next node. Branch, filter, or hand off to other integrations from there.
The integration includes 27 ready-made modules for finance work — each run logs its inputs and outputs for debugging.
FastBill workflow on the canvas: Watch Events then Create a Contact
Triggers, searches and actions
Open any FastBill trigger, search, or action to see its inputs and outputs — 1 trigger, 7 searchs, 26 actions.
Triggers
Use one of 1 trigger to kick off a workflow as soon as an event occurs in the app.
- Watch Events
Searches
This integration includes 7 search modules for looking data up mid-run.
- Get Articles
- Get Contacts
- Get Customers
- Get Documents
- Get Invoices
2more searches
Actions
Take action during a run with 26 available modules that write data back into the app.
- Cancel an Invoice
- Complete an Invoice
- Create a Contact
- Create a Customer
- Create a Document
21more actions
Explore the fields available for each FastBill trigger, search, and action.
Triggers
Output fields
| Field | Type |
|---|---|
User ID | number |
Email address | |
Name | text |
Date created | date |
Searches
Input fields
| Field | Type |
|---|---|
Article Number | text |
Limit | number |
Output fields
| Field | Type |
|---|---|
Article ID | text |
Article number | text |
Type | text |
Title | text |
Description | text |
Unit | text |
Unit price | number |
Currency code | text |
Vat percent | number |
Is gross | number |
Tags | array |
Input fields
| Field | Type |
|---|---|
Customer ID | choice |
Customer Number | text |
Search Term | text |
Contact ID | choice |
Limit | number |
Output fields
| Field | Type |
|---|---|
Customer ID | text |
Customer number | text |
Days for payment | number |
Created | date |
Payment type | number |
Bank name | text |
Bank account number | text |
Bank code | text |
Bank account owner | text |
Bank iban | text |
Bank bic | text |
Bank account mandate reference | text |
Show payment notice | boolean |
Account receivable | text |
Customer type | text |
Top | text |
Newsletter optin deprecated | number |
Organization | text |
Position | text |
Academic degree | text |
20other output fields
Input fields
| Field | Type |
|---|---|
Customer IDRequired | choice |
Customer Number | text |
Country Code | text |
City | text |
Search Term | text |
Limit | number |
Output fields
| Field | Type |
|---|---|
Customer ID | text |
Customer number | text |
Days for payment | number |
Created | date |
Payment type | number |
Bank name | text |
Bank account number | text |
Bank code | text |
Bank account owner | text |
Bank iban | text |
Bank bic | text |
Bank account mandate reference | text |
Show payment notice | boolean |
Account receivable | text |
Customer type | text |
Top | text |
Newsletter optin deprecated | number |
Organization | text |
Position | text |
Academic degree | text |
20other output fields
Input fields
| Field | Type |
|---|---|
Folder ID | text |
Limit | number |
Output fields
| Field | Type |
|---|---|
Folders | array |
Documents | array |
Input fields
| Field | Type |
|---|---|
Invoice ID | choice |
Invoice Number | text |
Invoice Title | text |
Customer ID | choice |
Start Due Date | date |
End Due Date | date |
Start Paid Date | date |
End Paid Date | date |
Start Date | date |
End Date | date |
Payment Type | text |
Start Last Update | date |
End Last Update | date |
Limit | number |
Output fields
| Field | Type |
|---|---|
Invoice ID | text |
Type | text |
Customer ID | text |
Customer number | text |
Customer costcenter ID | text |
Organization | text |
Salutation | text |
First name | text |
Last name | text |
Address | text |
Address 2 | text |
Zipcode | text |
City | text |
Comment | text |
Payment type | number |
Days for payment | number |
Bank name | text |
Bank account number | text |
Bank code | text |
Bank account owner | text |
25other output fields
Input fields
| Field | Type |
|---|---|
Project ID | choice |
Customer ID | choice |
Output fields
| Field | Type |
|---|---|
Project ID | text |
Project name | text |
Customer ID | text |
Customer costcenter ID | text |
Hour price | number |
Currency code | text |
Vat percent | number |
Start date | text |
End date | text |
Tasks | array |
Input fields
| Field | Type |
|---|---|
Invoice ID | choice |
Output fields
| Field | Type |
|---|---|
Customer ID | text |
Customer number | text |
Days for payment | number |
Created | date |
Payment type | number |
Bank name | text |
Bank account number | text |
Bank code | text |
Bank account owner | text |
Bank iban | text |
Bank bic | text |
Bank account mandate reference | text |
Show payment notice | boolean |
Account receivable | text |
Customer type | text |
Top | text |
Newsletter optin deprecated | number |
Organization | text |
Position | text |
Academic degree | text |
20other output fields
Actions
Input fields
| Field | Type |
|---|---|
Invoice IDRequired | choice |
Output fields
| Field | Type |
|---|---|
Status | text |
Input fields
| Field | Type |
|---|---|
Invoice IDRequired | choice |
Output fields
| Field | Type |
|---|---|
Status | text |
Invoice ID | number |
Input fields
| Field | Type |
|---|---|
Customer IDRequired | choice |
Organization | text |
Academic Degree | text |
Position | text |
Salutation | choice |
First Name | text |
Last Name | text |
Address | text |
Address 2 | text |
ZIP Code | text |
City | text |
Country Code | text |
Secondary Address | text |
Phone | text |
Phone 2 | text |
Fax | text |
Mobile | text |
Email | |
VAT ID | text |
Currency Code | text |
2other input fields
Output fields
| Field | Type |
|---|---|
Status | text |
Contact ID | number |
Input fields
| Field | Type |
|---|---|
Customer TypeRequired | choice |
Customer Number | text |
Position | text |
Academic Degree | text |
Salutation | choice |
Address | text |
Address 2 | text |
Secondary Address | text |
ZIP Code | text |
City | text |
State | text |
Country Code | text |
Phone | text |
Phone 2 | text |
Fax | text |
Mobile | text |
Email | |
Website | url |
Account Receivable | text |
Currency Code | text |
10other input fields
Output fields
| Field | Type |
|---|---|
Status | text |
Customer ID | number |
Input fields
| Field | Type |
|---|---|
Document Type | text |
Title | text |
Date | date |
Note | text |
Document | text |
Output fields
| Field | Type |
|---|---|
Status | text |
Customer ID | number |
Input fields
| Field | Type |
|---|---|
Article numberRequired | text |
TitleRequired | text |
Unit priceRequired | number |
Product type | choice |
Description | text |
Product unit type | text |
Currency code | text |
VAT Percent | number |
Is Gross | choice |
Output fields
| Field | Type |
|---|---|
Status | text |
Article ID | number |
Input fields
| Field | Type |
|---|---|
Customer IDRequired | choice |
ItemsRequired | array |
Customer Cost Center ID | text |
Contact ID | text |
Currency Code | text |
Template ID | text |
Template Hash | text |
Introduction Text | text |
Invoice Title | text |
Invoice Date | date |
Delivery Date | date |
Service Period Start | date |
Service Period End | date |
Cash Discount Percent | number |
Cash Discount Days | number |
VAT Case | boolean |
Is Gross | boolean |
Output fields
| Field | Type |
|---|---|
Status | text |
Invoice ID | number |
Input fields
| Field | Type |
|---|---|
Project NameRequired | text |
Customer IDRequired | choice |
Customer Cost Center ID | text |
Hour Price | number |
Currency Code | text |
VAT Percent | number |
Start Date | date |
End Date | date |
Output fields
| Field | Type |
|---|---|
Status | text |
Input fields
| Field | Type |
|---|---|
Customer IDRequired | choice |
Start DateRequired | date |
FrequencyRequired | choice |
Output TypeRequired | choice |
ItemsRequired | array |
Customer Cost Center ID | text |
Currency Code | text |
Template ID | text |
Introduction Text | text |
Occurrences | number |
Email Notify | boolean |
Delivery Date | date |
Cash Discount Percent | number |
Cash Discount Days | number |
VAT Case | boolean |
Template Hash | text |
Output fields
| Field | Type |
|---|---|
Status | text |
Invoice ID | number |
Input fields
| Field | Type |
|---|---|
Customer IDRequired | choice |
Input fields
| Field | Type |
|---|---|
Customer IDRequired | choice |
Input fields
| Field | Type |
|---|---|
Article IDRequired | choice |
Input fields
| Field | Type |
|---|---|
Invoice IDRequired | choice |
Input fields
| Field | Type |
|---|---|
Project IDRequired | choice |
Input fields
| Field | Type |
|---|---|
Recurring Invoice IDRequired | choice |
Input fields
| Field | Type |
|---|---|
Invoice IDRequired | choice |
Output fields
| Field | Type |
|---|---|
Status | text |
Input fields
| Field | Type |
|---|---|
Headers | array |
Header | object |
Body | text |
Output fields
| Field | Type |
|---|---|
Body | text |
Headers | object |
Status code | number |
Input fields
| Field | Type |
|---|---|
Invoice IDRequired | choice |
Date of Received Payment | date |
Payment Method | text |
Output fields
| Field | Type |
|---|---|
Status | text |
Invoice ID | number |
Input fields
| Field | Type |
|---|---|
Invoice IDRequired | choice |
RecipientRequired | object |
To | |
Cc | |
Bcc | |
Subject | text |
Message | text |
Receipt Confirmation | choice |
Output fields
| Field | Type |
|---|---|
Status | text |
Input fields
| Field | Type |
|---|---|
Invoice IDRequired | choice |
Output fields
| Field | Type |
|---|---|
Status | text |
Remaining Credits | text |
Input fields
| Field | Type |
|---|---|
Contact IDRequired | choice |
Customer ID | choice |
Organization | text |
Academic Degree | text |
Position | text |
Salutation | choice |
First Name | text |
Last Name | text |
Address | text |
Address 2 | text |
ZIP Code | text |
City | text |
Country Code | text |
Secondary Address | text |
Phone | text |
Phone 2 | text |
Fax | text |
Mobile | text |
Email | |
VAT ID | text |
3other input fields
Output fields
| Field | Type |
|---|---|
Status | text |
Contact ID | number |
Input fields
| Field | Type |
|---|---|
Customer IDRequired | choice |
Customer Type | choice |
Customer Number | text |
Position | text |
Academic Degree | text |
Salutation | choice |
Address | text |
Address 2 | text |
Secondary Address | text |
ZIP Code | text |
City | text |
State | text |
Country Code | text |
Phone | text |
Phone 2 | text |
Fax | text |
Mobile | text |
Email | |
Website | url |
Account Receivable | text |
11other input fields
Output fields
| Field | Type |
|---|---|
Status | text |
Customer ID | number |
Input fields
| Field | Type |
|---|---|
Article IDRequired | choice |
Article number | text |
Title | text |
Unit price | number |
Product type | choice |
Description | text |
Product unit type | text |
Currency code | text |
VAT Percent | number |
Is Gross | choice |
Output fields
| Field | Type |
|---|---|
Status | text |
Article ID | number |
Input fields
| Field | Type |
|---|---|
Invoice IDRequired | choice |
Customer ID | choice |
Items | array |
Customer Cost Center ID | text |
Contact ID | text |
Currency Code | text |
Template ID | text |
Template Hash | text |
Introduction Text | text |
Invoice Title | text |
Invoice Date | date |
Delivery Date | date |
Service Period Start | date |
Service Period End | date |
Cash Discount Percent | number |
Cash Discount Days | number |
VAT Case | boolean |
Is Gross | boolean |
Output fields
| Field | Type |
|---|---|
Status | text |
Input fields
| Field | Type |
|---|---|
Project IDRequired | choice |
Project Name | text |
Customer ID | choice |
Customer Cost Center ID | text |
Hour Price | number |
Currency Code | text |
VAT Percent | number |
Start Date | date |
End Date | date |
Output fields
| Field | Type |
|---|---|
Status | text |
Input fields
| Field | Type |
|---|---|
Recurring Invoice IDRequired | choice |
Customer IDRequired | choice |
Start Date | date |
Frequency | choice |
Output Type | choice |
Items | array |
Customer Cost Center ID | text |
Currency Code | text |
Template ID | text |
Introduction Text | text |
Occurrences | number |
Email Notify | boolean |
Delivery Date | date |
Cash Discount Percent | number |
Cash Discount Days | number |
VAT Case | boolean |
Template Hash | text |
Delete Existing Items | choice |
Output fields
| Field | Type |
|---|---|
Status | text |