Architecture for high volumes
For millions of messages per day volumes, the architecture must include: queue management for throughput, multiple sending service instances with load balancing, circuit breakers for Meta API failures.
Meta rate limiting must be managed at the architectural level.
Multi-tenant and governance
Large companies with multiple business units need a governance layer for WhatsApp: centralized vs business-unit templates, cost center reporting, and granular permissions.
Legacy system integration
Use middleware like MuleSoft, IBM Integration Bus, or Apache Camel to bridge legacy systems with the Chat API.
SLA and disaster recovery
For enterprise-critical use cases, define clear SLAs with the provider and implement a disaster recovery plan: fallback channel (SMS, email), escalation procedures.
