# How to Integrate Infusionsoft (Keap) with V0

- Tool: V0
- Difficulty: Intermediate
- Time required: 30 minutes
- Last updated: March 2026

## TL;DR

To integrate Infusionsoft (Keap) with V0 by Vercel, create a Next.js API route that submits lead data to the Keap REST API, store your Keap API key or OAuth credentials in Vercel environment variables, and use V0 to generate lead capture forms. New contacts are synced to Keap CRM and can trigger automated follow-up campaigns.

## Connect Lead Capture Forms to Infusionsoft Keap via V0 and Next.js

Keap (which still powers the Infusionsoft product) is a popular CRM and marketing automation platform used by hundreds of thousands of small businesses. Its REST API lets you programmatically create and update contacts, manage tags, trigger campaign sequences, and read customer data — making it possible to integrate your V0-generated web app directly with your Keap CRM without manual data entry or third-party connectors like Zapier.

The most valuable integration pattern is a lead capture flow: a visitor fills out a form on your V0 app, the form data is submitted to a Next.js API route, the API route creates a new contact in Keap via the REST API, and Keap's automation engine fires the appropriate follow-up campaign based on tags applied during contact creation. This replaces manual data entry and ensures leads are followed up instantly.

Keap offers two authentication options: a personal API key for single-user integrations (available in Keap's developer settings) and OAuth2 for multi-user apps. For most V0 app integrations — where you are the Keap account owner building a lead capture tool — the personal API key is simpler and sufficient. The API key authenticates all requests from your server-side API routes, keeping it completely hidden from the browser.

## Before you start

- A Keap (Infusionsoft) account — Max Classic, Pro, or a newer Keap plan all support the REST API
- Your Keap personal API key from Keap's account settings, or OAuth2 credentials from developer.keap.com for multi-user apps
- A V0 account at v0.dev and a Vercel account for deployment
- Familiarity with how Keap tags and campaigns work is helpful for setting up automation triggers

## Step-by-step guide

### 1. Generate the Lead Capture Form UI with V0

Open V0 at v0.dev and craft a detailed prompt for your lead capture form or CRM interface. For lead capture, describe the form fields you need, the layout (single column vs two column), any validation messages, and what should happen after submission (success message, redirect, or confetti animation). For a CRM dashboard, describe the table layout, the detail panel, and the filters. V0 generates a complete React component with Tailwind CSS — review the preview and refine with follow-up prompts until the design looks right. Once you are satisfied, push the code to GitHub via the V0 Git panel. Vercel will auto-deploy the latest version. The form will have placeholder submission logic until the API route is connected in Step 2. You can continue building the UI while setting up the backend in parallel — the two are independent until the final wiring step.

**Expected result:** A styled lead capture form renders in the V0 preview with all fields, validation, and success/error states. Submitting the form shows a success message (with mock logic) — real Keap submission will work after the API route is created.

### 2. Create the Keap API Route

Create a Next.js API route that accepts a POST request with contact form data and creates a new contact in Keap. The Keap REST API base URL is https://api.infusionsoft.com/crm/rest/v1 (the API still uses the infusionsoft.com domain). To create a contact, make a POST request to /contacts with a JSON body containing the contact's details. Authentication uses a personal API key passed as a query parameter (?access_token=) or as a Bearer token in the Authorization header. The personal API key approach is simpler for single-owner integrations. After creating the contact, you can optionally apply tags to trigger Keap automation campaigns — make a POST to /contacts/{contactId}/tags with the tag IDs you want to apply. Tag IDs are found in your Keap admin under CRM → Tags.

```
import { NextRequest, NextResponse } from 'next/server';

const KEAP_API_BASE = 'https://api.infusionsoft.com/crm/rest/v1';

interface ContactFormData {
  firstName: string;
  lastName: string;
  email: string;
  phone?: string;
  company?: string;
  interest?: string;
  subscribeToEmail?: boolean;
}

const INTEREST_TAG_MAP: Record<string, number> = {
  'Free Trial': parseInt(process.env.KEAP_TAG_TRIAL ?? '0', 10),
  'Pricing': parseInt(process.env.KEAP_TAG_PRICING ?? '0', 10),
  'Demo': parseInt(process.env.KEAP_TAG_DEMO ?? '0', 10),
  'General Inquiry': parseInt(process.env.KEAP_TAG_GENERAL ?? '0', 10),
};

export async function POST(request: NextRequest) {
  const apiKey = process.env.KEAP_API_KEY;
  if (!apiKey) {
    return NextResponse.json({ error: 'Keap API key not configured' }, { status: 500 });
  }

  let body: ContactFormData;
  try {
    body = await request.json();
  } catch {
    return NextResponse.json({ error: 'Invalid request body' }, { status: 400 });
  }

  if (!body.email) {
    return NextResponse.json({ error: 'Email is required' }, { status: 400 });
  }

  const contactPayload = {
    given_name: body.firstName,
    family_name: body.lastName,
    email_addresses: [{ email: body.email, field: 'EMAIL1' }],
    phone_numbers: body.phone ? [{ number: body.phone, field: 'PHONE1' }] : [],
    company: body.company ? { company_name: body.company } : undefined,
    opt_in_reason: body.subscribeToEmail ? 'Form submission' : undefined,
  };

  try {
    const createResponse = await fetch(`${KEAP_API_BASE}/contacts?access_token=${apiKey}`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(contactPayload),
    });

    if (!createResponse.ok) {
      const errorText = await createResponse.text();
      return NextResponse.json(
        { error: `Keap API error: ${createResponse.status}`, details: errorText },
        { status: createResponse.status }
      );
    }

    const contact = await createResponse.json();

    // Apply tag based on interest field if configured
    if (body.interest && INTEREST_TAG_MAP[body.interest]) {
      const tagId = INTEREST_TAG_MAP[body.interest];
      await fetch(`${KEAP_API_BASE}/contacts/${contact.id}/tags?access_token=${apiKey}`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ tagIds: [tagId] }),
      });
    }

    return NextResponse.json({ success: true, contactId: contact.id });
  } catch (error) {
    console.error('Keap API route error:', error);
    return NextResponse.json({ error: 'Failed to create Keap contact' }, { status: 500 });
  }
}
```

**Expected result:** The API route is created. Testing with a tool like curl or a REST client with a valid KEAP_API_KEY returns a Keap contact ID and the contact appears in your Keap CRM.

### 3. Add Keap Credentials to Vercel

Your Keap API key and any tag ID environment variables need to be stored in Vercel as encrypted environment variables. The Keap personal API key is found in your Keap account: log in at app.keap.com, click your profile avatar, go to Account Info → API, and find your personal API key (a long alphanumeric string). Open Vercel Dashboard → your project → Settings → Environment Variables and add the following: KEAP_API_KEY (your personal API key), and optionally KEAP_TAG_TRIAL, KEAP_TAG_PRICING, KEAP_TAG_DEMO, and KEAP_TAG_GENERAL with the numeric tag IDs from your Keap account. To find tag IDs, go to your Keap admin → CRM → Tags, click on a tag, and look at the URL — the number at the end is the tag ID. Select Production and Preview environments for all variables. Trigger a redeployment after adding variables.

```
# .env.local (do NOT commit)
KEAP_API_KEY=your_personal_api_key_here
KEAP_TAG_TRIAL=12345
KEAP_TAG_PRICING=12346
KEAP_TAG_DEMO=12347
KEAP_TAG_GENERAL=12348
```

**Expected result:** KEAP_API_KEY and optional tag variables appear in Vercel project settings. After the next deployment, submitting your lead form creates a real contact in your Keap CRM.

### 4. Test the Full Lead Flow and Connect the UI

With the API route deployed and environment variables set, update your V0 component's form submission handler to POST to /api/keap/contacts. The component should send a JSON body with the form field values matching the ContactFormData interface in your API route. After submitting, check your Keap CRM to confirm the new contact was created with the correct fields and tags applied. If tags are applied and you have automation campaigns configured for those tags, Keap will begin the campaign sequence automatically. Test edge cases: submit without an email address (should fail validation), submit the same email twice (should not create duplicate), and submit with an invalid phone number (Keap accepts most phone formats). For complex Keap setups with custom fields, automation sequences, or multi-user OAuth flows, RapidDev's team can help configure the integration beyond standard contact creation.

```
'use client';

import { useState } from 'react';

export default function LeadForm() {
  const [loading, setLoading] = useState(false);
  const [success, setSuccess] = useState(false);
  const [error, setError] = useState<string | null>(null);

  async function handleSubmit(e: React.FormEvent<HTMLFormElement>) {
    e.preventDefault();
    setLoading(true);
    setError(null);
    const formData = new FormData(e.currentTarget);
    try {
      const res = await fetch('/api/keap/contacts', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          firstName: formData.get('firstName'),
          lastName: formData.get('lastName'),
          email: formData.get('email'),
          phone: formData.get('phone'),
          company: formData.get('company'),
          interest: formData.get('interest'),
          subscribeToEmail: formData.get('subscribeToEmail') === 'on',
        }),
      });
      const data = await res.json();
      if (!res.ok) throw new Error(data.error ?? 'Submission failed');
      setSuccess(true);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Submission failed');
    } finally {
      setLoading(false);
    }
  }

  if (success) {
    return <div className="text-green-600 p-6">Thanks! We will be in touch within 24 hours.</div>;
  }

  return (
    <form onSubmit={handleSubmit} className="space-y-4 max-w-md mx-auto p-6">
      {error && <p className="text-red-500">{error}</p>}
      {/* form fields omitted for brevity */}
      <button type="submit" disabled={loading} className="w-full bg-blue-600 text-white py-2 rounded">
        {loading ? 'Submitting...' : 'Submit'}
      </button>
    </form>
  );
}
```

**Expected result:** Submitting the live form on your Vercel deployment creates a real contact in your Keap CRM. The contact appears in CRM → Contacts with the correct name, email, and any tags applied. If automation campaigns are triggered by those tags, Keap begins sending follow-up emails automatically.

## Best practices

- Always store the Keap API key in Vercel environment variables — never hardcode it in source files or pass it through V0 chat messages. The key provides full CRM access and must be treated as a high-security secret.
- Use Keap tags strategically to trigger automation. Rather than building complex follow-up logic in your Next.js app, let Keap's powerful campaign automation engine handle sequences — your API route simply applies the right tag and Keap does the rest.
- Add the duplicate_option: 'Email' parameter to contact creation requests to prevent duplicate contacts when users submit the same form multiple times.
- Validate email addresses in your API route before sending them to Keap. Keap may accept malformed emails that then cause issues in campaign sending. Use a simple regex or a library like validator.js.
- Consider rate limiting your lead capture API route to prevent form spam. Implement a simple in-memory counter or use Vercel KV to track submissions per IP address per time window.
- Log successful contact creations (with contact ID, not personal data) to help debug issues. The Vercel Functions log is accessible in Vercel Dashboard → Functions.
- When using OAuth2 for multi-user integrations, implement token refresh logic. Keap OAuth tokens expire and must be refreshed using the refresh token before they expire.

## Use cases

### Lead Capture Landing Page

Build a high-conversion landing page with a lead capture form that automatically creates contacts in Keap and triggers a nurture campaign. The form captures name, email, phone, and any custom fields relevant to your business.

Prompt example:

```
Create a landing page with a hero section and a lead capture form in a card on the right side. The form has fields for First Name, Last Name, Email, Phone, and a dropdown for 'How did you hear about us?' with options Website, Referral, Social Media, and Event. Include a submit button with a loading state. On success, show a thank-you message. POST to /api/keap/contacts.
```

### CRM Contact Dashboard

Build an internal dashboard that displays your Keap contacts with search, filter by tag, and the ability to view contact details without logging into Keap directly. Sales teams can quickly look up contacts and see their automation status.

Prompt example:

```
Design a CRM contact list with a search bar, tag filter chips, and a table showing Contact Name, Email, Phone, Tags, and Date Added. Clicking a row opens a detail panel on the right showing all contact fields and recent activity. Add a Create Contact button that opens a form modal. Fetch contacts from /api/keap/contacts.
```

### Event Registration Form with Keap Tagging

Create an event registration form that adds registrants to Keap with a specific tag identifying which event they registered for. Keap can then automatically send confirmation emails, reminders, and post-event follow-ups based on the tag.

Prompt example:

```
Build an event registration form with name, email, company, and job title fields. Add a hidden field for the event name. Include a checkbox for newsletter opt-in. On submit, show a spinner then a confirmation card saying 'You are registered!' with event details. POST to /api/keap/register.
```

## Troubleshooting

### API returns 401 Unauthorized with 'access_token is required or invalid'

Cause: The KEAP_API_KEY environment variable is missing, expired, or incorrect. Keap personal API keys can be regenerated in account settings, which invalidates the old key.

Solution: Log in to app.keap.com → Profile avatar → Account Info → API and verify your personal API key matches the value in Vercel. If you recently regenerated the key in Keap, update KEAP_API_KEY in Vercel environment variables and trigger a redeployment.

### Contact is created but tags are not applied and no automation campaigns fire

Cause: The tag IDs in your environment variables (KEAP_TAG_TRIAL, etc.) do not match the actual tag IDs in your Keap account, so the tag application request silently fails or is applied to a non-existent tag.

Solution: Verify tag IDs by navigating to CRM → Tags in your Keap admin and clicking each tag — the ID is in the URL. Update the corresponding environment variables in Vercel with the correct numeric IDs. Also confirm that automation campaigns are set up in Keap to trigger on those specific tags.

### Duplicate contacts are created when the same email is submitted twice

Cause: The Keap API creates a new contact even if the email already exists when the duplicate_option parameter is not set.

Solution: Add 'duplicate_option': 'Email' to your contact creation payload. This tells Keap to update the existing contact instead of creating a duplicate when an email address already exists in your CRM.

```
// Add duplicate_option to the contact payload
const contactPayload = {
  given_name: body.firstName,
  family_name: body.lastName,
  email_addresses: [{ email: body.email, field: 'EMAIL1' }],
  duplicate_option: 'Email', // update existing contact instead of creating duplicate
};
```

## Frequently asked questions

### What is the difference between Infusionsoft and Keap?

Infusionsoft was rebranded to Keap in 2019. The company and underlying platform are the same — Keap, Inc. still operates both the Keap product line (more streamlined, targeting small businesses) and Keap Max Classic (the original Infusionsoft product with more advanced features). The API still uses the api.infusionsoft.com domain.

### Is there a free tier of Keap I can use for testing?

Keap offers a 14-day free trial with full API access. After the trial, you need a paid subscription. Keap Pro starts around $129/month. The developer portal at developer.keap.com has a sandbox environment you can use for testing without a full account.

### Can my V0 app read existing contacts from Keap, or only create new ones?

The Keap REST API supports full CRUD operations. You can fetch contacts (GET /contacts with search parameters), update contacts (PUT /contacts/{id}), delete contacts, and search by email, name, or tag. Your V0 dashboard components can display and update Keap data in any direction.

### Do I need OAuth2 or can I use a simple API key?

For integrations where your V0 app connects only to your own Keap account, use a personal API key — it is much simpler. Use OAuth2 only if you are building a product that other Keap account owners will use to connect their own accounts. Register at developer.keap.com for OAuth2 credentials.

### How do I trigger Keap automated campaigns from my V0 app?

The most reliable way to trigger Keap campaigns from your V0 API route is by applying tags to contacts. Create tags in Keap's Campaign Builder, set campaign entry triggers on those tags, and then apply the tags via the REST API after creating a contact. Keap's campaign engine handles the rest automatically.

### What is the Keap API rate limit?

Keap's REST API has a rate limit of 125 requests per second per account. For most lead capture forms, this limit is more than sufficient. If you are building a high-volume integration (batch imports, mass updates), implement request queuing and respect the rate limit to avoid 429 errors.

---

Source: https://www.rapidevelopers.com/v0-integrations/infusionsoft-by-keap
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