For Camunda 8.8, I recommend using a wrapper API with the unified Camunda 8 REST API (v2) rather than direct API calls, as this gives you the control you need for custom logic and database synchronization. I found the following relevant resources:
- User task lifecycle with Camunda 8 REST API
- Camunda 8.8 API announcements and CamundaClient
- Custom tasklist architecture for database sync
- Access control patterns for wrapper APIs
- Migration challenges from v1 to v2 API
- Tasklist API v1 deprecation timeline
Does this help? If not, can anyone from the community jump in? 
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