TL;DR: Agencies and resellers need an API or platform that keeps each client separate, lets clients connect their own numbers, shows usage per client and keeps costs predictable. Look for multi-tenant isolation, Embedded Signup, per-client reporting and clear fees. IntelliPortal provides a multi-tenant REST API, and Intelli's platform includes reseller tools for managing clients.
What is different about managing many clients?
One business needs one WhatsApp setup. An agency needs many, and every extra client multiplies the work: verification, templates, billing, support and reporting. The wrong provider turns each new client into a manual project. The right one makes adding a client routine.
What should agencies and resellers look for?
Requirement | Why it matters |
|---|---|
Client isolation | One client's messages and data never mix with another's |
Self-serve onboarding | Clients connect their own number without your team doing Meta setup each time |
Per-client usage visibility | You can bill or report accurately |
Clear fee structure | Know what you pay and what Meta charges |
Scoped access | Staff and tools see only what they need |
Reliable webhooks | Missed events mean unhappy clients |
Sandbox | Test client flows before going live |
Support you can reach | You are the first call when something breaks |
How do you choose between an API and a platform?
Build on an API if you run your own product or custom workflows. IntelliPortal offers:
Multi-tenant design where each client is isolated under its own reference, and a Clients section in the dashboard.
Embedded Signup so clients connect their WhatsApp numbers and Instagram accounts without manual Meta setup. See the documentation.
Scoped Bearer API keys, signed webhooks with retries and delivery logs, and a sandbox.
Use a platform if you manage inboxes and AI assistants for clients rather than build software. The Intelli platform offers a shared inbox, AI assistants, broadcasts and a catalogue, plus reseller tools for viewing your clients and their usage. Ask for a demo to see how they fit your setup.
What does it cost?
IntelliPortal plans:
Plan | Price | Messages included per month | After included messages |
|---|---|---|---|
Free / Dev | $0 | 1,000 | $0.005 per message |
Growth | $49 per month | 15,000 | $0.004 per message |
Scale | $199 per month | 65,000 | $0.003 per message |
Inbound and outbound messages both count, and outbound template messages carry Meta's published template price on top. Plan details appear in the dashboard after you create a free account, so check it for current terms. For Meta's fees, see its pricing page.
Decide early how you price to clients: pass costs through, add a margin or bundle messages into a monthly fee.
What rules still apply to every client?
Templates for messages outside the 24-hour window. See how to write templates that get approved.
Opt-in under WhatsApp's Business Messaging Policy.
Messaging limits that grow with quality. See how to increase your messaging tier.
Business verification per client.
One client who breaks the rules should not hurt another, which is why isolation matters. Give every client written guidance on opt-in and content.
How do you onboard a new client?
Create the client under its own reference.
Send them through Embedded Signup to connect their number.
Submit their templates.
Configure their webhook or inbox.
Test in the sandbox, then go live with opted-in contacts.
Review usage monthly.
What should you ask a provider?
How is client data separated?
Can I see usage per client?
Who handles Meta verification problems?
What happens if one client's account is restricted?
Is there a sandbox for testing?
Who can I contact quickly?
For a broader comparison, see our guide to the best WhatsApp Business API.
Want to see how agencies run clients on Intelli? Create a free IntelliPortal account, book a demo or email [email protected].
Frequently Asked Questions
What is the best WhatsApp API for agencies? One with client isolation, Embedded Signup, per-client usage visibility and clear fees.
Can clients connect their own numbers? Yes, through Embedded Signup, which lets clients connect without manual Meta setup.
Can I resell WhatsApp messaging? Many agencies do. Check your provider's terms and make sure clients follow WhatsApp's policies.
How do I bill clients? Track usage per client and choose pass-through pricing, a margin or a bundled monthly fee.
Does it support Instagram too? IntelliPortal supports both WhatsApp and Instagram through its unified API.
