Invoice Ninja email verification with BillionVerify
Invoice Ninja is an open-source invoicing and billing platform popular with freelancers and small businesses. Pairing it with BillionVerify lets you confirm client email addresses are valid and reachable before sending quotes, invoices, or payment reminders — protecting both delivery rates and your professional reputation.
Why verify before the send
Sending an invoice to a misspelled or defunct email address means your client never receives it — and may never know a payment is due. BillionVerify adds a verification checkpoint to your Invoice Ninja workflow so every billing communication is directed at a confirmed, deliverable address.
Ready-to-use n8n workflow
Import this workflow into n8n — it verifies every address with BillionVerify before Invoice Ninja sends, so only deliverable contacts are emailed. Install the BillionVerify community node first, then add your API key. Adapted from this n8n template
{
"name": "Automate invoice creation and delivery with Google Sheets, Invoice Ninja and Gmail + BillionVerify",
"nodes": [
{
"id": "1009fb50-b8fe-4949-8756-c61311d0ab1f",
"name": "0. Google Sheets (Invoice Trigger)",
"type": "n8n-nodes-base.googleSheetsTrigger",
"position": [
-112,
64
],
"parameters": {},
"description": "Triggers when a project's status is changed to 'Ready for Invoice'.",
"typeVersion": 1
},
{
"id": "bba87058-2b13-4f63-8999-f45b43256ff5",
"name": "1. HTTP Request (Create Invoice)",
"type": "n8n-nodes-base.httpRequest",
"position": [
144,
64
],
"parameters": {},
"description": "Sends data to the invoicing service API to create a new invoice.",
"typeVersion": 1
},
{
"id": "adbca28b-bd7a-488d-86bd-8280be4cebb7",
"name": "2. Gmail (Send Invoice)",
"type": "n8n-nodes-base.gmail",
"position": [
400,
64
],
"parameters": {},
"description": "Emails the newly created invoice to the client.",
"typeVersion": 1
},
{
"id": "029aee61-c444-4445-bd04-00ac3b86d708",
"name": "3. Google Sheets (Update Status)",
"type": "n8n-nodes-base.googleSheets",
"position": [
640,
64
],
"parameters": {},
"description": "Updates the project status to 'Invoiced' in Google Sheets.",
"typeVersion": 3
},
{
"id": "8d23368c-48fe-4752-a277-0d320b9045ae",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-192,
0
],
"parameters": {
"content": ""
},
"typeVersion": 1
},
{
"id": "33b56fca-b0c9-4c74-a17c-134aa775045c",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-192,
304
],
"parameters": {
"content": ""
},
"typeVersion": 1
},
{
"parameters": {
"operation": "verify",
"email": "={{ $json.email || $json.Email }}",
"additionalOptions": {}
},
"type": "n8n-nodes-billionverify.billionVerify",
"typeVersion": 1,
"position": [
40,
64
],
"name": "Verify Email (BillionVerify)",
"credentials": {
"billionVerifyApi": {
"id": "",
"name": "BillionVerify account"
}
}
},
{
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "loose"
},
"combinator": "and",
"conditions": [
{
"id": "is-deliverable",
"leftValue": "={{ $json.is_deliverable }}",
"rightValue": "",
"operator": {
"type": "boolean",
"operation": "true",
"singleValue": true
}
}
]
}
},
"type": "n8n-nodes-base.if",
"typeVersion": 2,
"position": [
220,
64
],
"name": "IF deliverable"
}
],
"connections": {
"2. Gmail (Send Invoice)": {
"main": [
[
{
"node": "3. Google Sheets (Update Status)",
"type": "main",
"index": 0
}
]
]
},
"1. HTTP Request (Create Invoice)": {
"main": [
[
{
"node": "Verify Email (BillionVerify)",
"type": "main",
"index": 0
}
]
]
},
"0. Google Sheets (Invoice Trigger)": {
"main": [
[
{
"node": "1. HTTP Request (Create Invoice)",
"type": "main",
"index": 0
}
]
]
},
"Verify Email (BillionVerify)": {
"main": [
[
{
"node": "IF deliverable",
"type": "main",
"index": 0
}
]
]
},
"IF deliverable": {
"main": [
[
{
"node": "2. Gmail (Send Invoice)",
"type": "main",
"index": 0
}
],
[]
]
}
},
"settings": {
"executionOrder": "v1"
}
}Workflow templates with Invoice Ninja
Ready-to-use workflows that verify emails before Invoice Ninja sends.
How it works
- 1
A client record is created or updated in Invoice Ninja, or an invoice event is about to fire.
- 2
An n8n workflow or Integrately automation captures the client's email address.
- 3
BillionVerify's API evaluates the address for validity, risk level, and email type.
- 4
The automation either proceeds to send the invoice or flags the record for review based on the result.
- 5
Your Invoice Ninja contact list remains populated with verified, reachable client addresses.
When to use this
Validate client emails when adding new contacts
When a new client is created in Invoice Ninja, trigger a BillionVerify check on their email. Catch typos and invalid addresses immediately, before the first invoice is ever sent.
Reduce failed payment reminder deliveries
Automate a verification pass before sending overdue payment reminders. Confirming the address is still active reduces the chance a reminder bounces and a payment slips through the cracks.
Screen imported client lists for bad emails
When migrating contacts from another system into Invoice Ninja, run the email list through BillionVerify's bulk verification first. Only import clean, deliverable addresses to start fresh with quality data.
FAQ
How do I trigger BillionVerify from Invoice Ninja?
Invoice Ninja supports webhooks on client and invoice events. Connect those webhooks to an n8n or Integrately workflow that calls the BillionVerify API, then updates the client record with the result.
What types of bad addresses does BillionVerify detect?
BillionVerify identifies invalid, non-existent, disposable, role-based (e.g. billing@, info@), and catch-all addresses — covering the most common sources of invoice delivery failures.
Can I use BillionVerify with the self-hosted version of Invoice Ninja?
Yes. BillionVerify operates as an external API service. Whether you run Invoice Ninja in the cloud or self-hosted, your automation layer can reach BillionVerify's REST API from either environment.
Is it worth verifying emails for one-off freelance clients?
Absolutely. A single bounced invoice to a new client creates a poor first impression and delays payment. A quick verification check costs very little and prevents an avoidable problem.
Verify emails in Invoice Ninja
Create a free account, grab your API key, and stop bounces before they happen.
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