Why do you need to integrate with Trello?
Of the many teams that contribute to the customer experience, the service team is the most visible to the customer. They engage customers and do the best they can. But they often need the help of internal teams like engineering, operations, logistics, and finance. And these teams do not talk to customers directly. Follow-up tasks, meant for these internal teams, may fall through the cracks during periods of high engagement. Or these internal teams may not have the right context to work on these tasks. In both cases, the customer experience is negatively impacted. That's going to remain a challenge unless your task management tool and your customer engagement tool talk to each other.
If you use Trello for task management, and Zoho Desk for customer service, you can now integrate the two and ensure nothing falls between the cracks.