Technical GuideStep-by-Step⏱ 15 min read

Connect Bubble.io to WhatsApp API: API Connector + Workflows

Bubble.io is the most powerful no-code app builder, thousands of Indian startups build their MVPs and SaaS products on Bubble. WA.Expert connects to Bubble via the API Connector plugin, letting you trigger WhatsApp from any Bubble workflow event: user signup, form submission, payment, status change.

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Overview

What this guide covers

Bubble's API Connector is one of its most powerful features, it lets you call any REST API from within Bubble workflows without leaving the no-code environment. Once configured, sending a WhatsApp becomes a simple workflow action available throughout your Bubble app.

Method	Complexity	Best for
API Connector Plugin	⭐ Easy: Bubble knowledge	Configure once, use across all workflows. No code at all.
Backend Workflows (API)	⭐⭐ Medium: Bubble API knowledge	Scheduled or triggered server-side workflows for async WhatsApp sends.
Zapier/Make via Bubble	⭐ Easy, no code	Alternative path if API Connector is not available on your plan.

Integration Methods

Step-by-step connection guides

Method 2 Backend Workflows: Async WhatsApp

Create a Backend Workflow

Bubble Editor → Backend Workflows → New API Workflow. Name: send_whatsapp_notification. Make it not exposed as a public API endpoint.

Add WhatsApp action

Inside the workflow: + Step → Plugins → WA.Expert → Send WhatsApp. Map parameters.

Schedule from frontend workflow

From any frontend workflow: Schedule API Workflow → select send_whatsapp_notification → set parameters → Run. Backend workflows run on Bubble's server, not the user's browser, more reliable for critical notifications.

Use for delayed WhatsApp

Backend workflows can be scheduled for the future: "Schedule API Workflow → run in 30 minutes" creates abandoned cart recovery flows, appointment reminders, or follow-up sequences.

// Bubble Backend Workflow: send_whatsapp
// Parameters: phone (text), template (text), vars (json)
// Step 1: Call WA.Expert API via API Connector

// Frontend workflow triggers it:
// "Schedule API Workflow"
//   Workflow: send_whatsapp
//   phone: Current User's Phone
//   template: "signup_welcome"
//   Run at: Current date/time + 0 seconds
//   (or + 30 minutes for delayed sends)

// For abandoned cart (30 min delay):
// Run at: Current date/time + 30 minutes
// Cancel if: User's cart is empty

FAQ

Common questions

Does Bubble.io have a WhatsApp plugin?

Bubble does not have a dedicated WhatsApp plugin on the marketplace. The standard approach is using the API Connector plugin (Bubble's official REST API integration) to connect to WA.Expert. This is actually more flexible than a dedicated plugin as it works with any API endpoint.

What Bubble plan supports the API Connector?

The API Connector plugin is available on Bubble Starter plan and above. The free Bubble plan does not support backend API calls. For Bubble apps that need WhatsApp, Starter plan (approximately $29/month) is the minimum required.

Can Bubble backend workflows send scheduled WhatsApp messages?

Yes. Bubble's "Schedule API Workflow" action can schedule backend workflows to run at a specific future time. This is used for: appointment reminders (schedule WhatsApp 24 hours before the appointment), follow-up sequences (schedule 3 WhatsApps at 30 min, 4 hr, 24 hr delays), and subscription renewal reminders.

How do I store phone numbers in Bubble for WhatsApp?

Create a phone field (type: text) on your User data type. When users sign up, collect their phone number in the registration form. For WhatsApp, phone must be in international format with country code. Add a Bubble workflow action to normalise Indian numbers: if phone starts with "0", replace with "+91"; if 10 digits, prefix "+91".

Can I use Bubble + WhatsApp to build a SaaS product?

Yes, several Indian SaaS products built on Bubble use WA.Expert for their end-customer WhatsApp notifications. The Bubble frontend manages the product logic, and WA.Expert is called via API Connector whenever notifications need to go out. This is a popular "build fast" stack for Indian B2B SaaS MVPs.

How do I handle WhatsApp API errors in Bubble?

In Bubble API Connector calls, enable "This call might fail" option. Then in your workflow, add a conditional branch for when the API call fails. Log the error to a Bubble data type for debugging, and optionally retry via a backend workflow. Common errors: 400 (wrong phone format), 401 (API key error), 429 (rate limit).

Ready to connect Bubble.io to WhatsApp?

API Connector configured once, used everywhere in your Bubble app. Every user action can trigger a WhatsApp in 2 workflow steps.

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