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WhatsApp Add Group Members API: Bulk Add Participants with Per-Member Results
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Add many numbers to a WhatsApp group in one POST request, with a result for every member
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INTRODUCTION
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Group chats are now a core channel for customer communities, cohort programs and internal teams. Manually inviting people one by one does not scale. Developers who build on WhatsApp messaging data need a WhatsApp API that can manage group membership from code, so onboarding can run straight from a CRM or an internal tool.
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FEATURED API
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The Add Group Members endpoint belongs to the WhatsApp Messaging API on Global API Gateway (opendata-api.com). It is a POST endpoint: /api/project/whatsapp-messaging/add-group-participants.
You send a JSON array of full international numbers, written as JSON numbers with digits only, for example [8613800138000,4915256515060]. The response contains per-member results, and a non-zero error marks the numbers that failed. The call requires admin permission in the group.
Request parameters shown in the online tester:
Session Id (required)
Group Jid (required), for example 120363012345678901@g.us
Body (required), the array of numbers
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WHAT CAN BE INTEGRATED
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Bulk add: add several members in one request via a JSON array
Per-member results: see exactly which numbers succeeded and which failed
Admin-gated: the call uses your admin rights in the group to add members
Retry logic: pick out the numbers with a non-zero error and handle them separately
Group lifecycle: pair it with the related operations Remove Group Members, Set Group Profile Picture, Update Group Settings and Promote / Demote Group Admins
Messaging workflows: follow the guide "How to Send WhatsApp Messages via API" to message the group once it is populated
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USE CASES
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[1] Cohort onboarding
Seed a new cohort group with a list of customers
Check the per-member results to see who was actually added
[2] Community growth
Grow a community by adding opted-in members in bulk
Retry or review the numbers that returned an error
[3] CRM-driven automation
Automate member onboarding from your CRM
Trigger the add call when a customer reaches a certain stage
[4] Group administration tools
Build an admin panel that adds, removes and re-configures members
Combine it with the admin promote/demote and group settings endpoints
[5] Operations and support teams
Add the right staff or customers to a support group on demand
Keep an audit trail from the per-member responses
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PRICING & GETTING STARTED
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Sign up and get 100 free API credits, no credit card required
Call the API with your own API key; the online tester on the page lets you run the request in the browser
Each endpoint has its own subscription plan; open the page to view the plans and pricing
Questions or other API needs: use the Contact Us page
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CONCLUSION
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If you need to manage WhatsApp group membership from code, this open data style endpoint gives you bulk adds with clear per-member feedback. Read the docs and try it for free here: