Designing a promotional WhatsApp workflow: the parts developers shouldn't overlook

When building a WhatsApp Business API integration, sending a message is only one part of the workflow.

A production campaign may need to handle several pieces of application logic:

1. Consent

The system should have a reliable way to associate a customer with their messaging consent rather than treating every phone number as a marketing contact.

1. Audience segmentation

Promotional campaigns usually work better when the application can distinguish between customer groups instead of broadcasting the same message to everyone.

1. Template management

Marketing messages generally need an appropriate approved template. Template selection should therefore be part of the campaign workflow rather than hard-coded into the application.

1. Opt-out handling

A user who no longer wants promotional communication should be handled appropriately by the system.

1. Delivery and campaign tracking

For larger campaigns, developers may also need to store message status, campaign IDs, customer segments, and engagement information.

I found this overview useful while researching the business side of promotional WhatsApp messaging:

https://www.intigate.co.in/blog/promotional-whatsapp-messages/

For developers working on WhatsApp integrations, I'm interested in how you've structured campaign consent and opt-out handling. Do you keep it inside the messaging service or in your application's customer/CRM layer?