B2B

WhatsApp API for Agencies: Shared Inbox, Client Workspaces & Reporting

How marketing agencies run multi-client WhatsApp Business API on WappBlaster, templates, inbox SLAs and client reporting.

Arjun Mehta Published 22 May 2026 Updated 1 Sept 2026 12 min read

Agencies need separated client contexts, template libraries per brand and exportable SLA reports.

Quick answer: Agencies need separated client contexts, template libraries per brand and exportable SLA reports. WappBlaster runs on the official Meta WhatsApp Business Platform at a flat ₹7,999 / $200 per year with 0% markup on Meta conversation charges.

Why this matters in 2026

B2B WhatsApp works differently from consumer messaging: smaller lists, longer cycles, several stakeholders per account, and a much lower tolerance for anything that reads as a blast. The approaches below assume that context rather than a mass-market one.

Recommended workflow

  1. Step 1: Onboard client WABA separately
  2. Step 2: Template library per brand voice
  3. Step 3: Team members tagged to client queues
  4. Step 4: Weekly CSV: response time, CSAT, sends
  5. Step 5: Invoice client platform + Meta pass-through separately

Production checklist

  • Per-client template namespaces
  • Agent roles and assignment
  • Weekly SLA export per client
  • 0% Meta markup helps agency margins

Metrics to track

  • Delivered %
  • Read %
  • Reply rate
  • Opt-out rate
  • Conversation cost per reply

How WappBlaster helps

WappBlaster is an official Meta WhatsApp Business Platform provider. The platform covers bulk campaigns, the chatbot and automations builders, AI agents, the shared inbox, commerce and payments, with no per-contact charge. If you are already with another provider, migration keeps your number and messaging tier and generally takes 1–2 days.

Bulk WhatsApp Marketing API Software (₹7,999/yr, 0% markup) · Legal bulk guide · Complete API guide.

Frequently asked questions

How should an agency separate client conversations?

Client workspaces or, at minimum, tags and departments per client, with roles restricting who sees what. Agencies that run every client through one undifferentiated inbox eventually send the wrong message to the wrong list.

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Who should own the client’s Meta Business Manager?

The client, with the agency as an admin. An agency that owns its clients’ Business Managers creates an exit problem for both sides and is a red flag to anyone auditing the arrangement.

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Does per-user pricing matter for agencies?

A great deal, because agency headcount on an inbox scales with clients. A flat platform fee changes the unit economics of taking on a small client.

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What reporting do agency clients actually want?

Delivered, read and reply rates per campaign, and cost per message. Send counts alone invite the question of what the client is paying for.

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Still not answered?

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Arjun Mehta

Head of WhatsApp Business API, WappBlaster

Arjun Mehta leads WappBlaster’s official Meta WhatsApp Business Platform practice, bulk campaigns, chatbot, shared inbox and BSP migrations for 1,000+ India, UAE, USA and UK brands.

Ready for official bulk WhatsApp?

Migrate from WATI, Interakt, AiSensy or bulk senders, 3–7 day cutover with 1:1 onboarding.

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