If you're integrating WhatsApp Business API into a SaaS or customer-facing application, the API connection itself is only one part of the work.
Some areas worth planning for early:
WhatsApp Business Account and phone-number onboarding
Meta authentication and Embedded Signup
Message templates and approval
Webhooks for incoming messages and delivery updates
Opt-in and messaging rules
Handling different message categories
Multi-tenant architecture if each customer has their own WhatsApp number
Retry handling and webhook failures
Logging message status and API errors
For a SaaS product, I think multi-tenant number management is one of the areas that deserves extra attention. Each customer may have their own WhatsApp Business Account, number, templates, and credentials.
I'd be interested to hear from other developers who have implemented this in production: what part of the WhatsApp API integration caused the most unexpected problems for you?
Intigate.co.in
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