How to send non-template Advanced Message via Azure Communication Services (ACS) using Power Automate within the 24h customer care window?

Question

Hi community! I’m working on a solution using PowerApps + Power Automate integrated with Azure Communication Services (ACS) to send messages via Advanced Messages.

Here’s the scenario:

During a customer service session (within the 24-hour window after the user’s last message), I’d like to send regular text messages (without using templates) directly through the ACS Advanced Messaging REST API.

The idea is that the agent types the message in PowerApps, and it’s delivered to the customer via Power Automate, calling the ACS endpoint.

My questions are: 👉 Is it possible to use the ACS REST API to send non-template WhatsApp messages, as long as it’s within the 24h customer care window? 👉 Has anyone implemented this flow (PowerApps → Power Automate → ACS → WhatsApp Channel) and could share an example of how to structure the request in Power Automate?

Thanks in advance for any guidance! 🙏

Answer 1

Yes, it's possible and easier than sending template messages. You need to send notification message operations within the 24-hour window as per documentation: https://learn.microsoft.com/en-us/rest/api/communication/advancedmessaging/notification-messages-operations/send?view=rest-communication-advancedmessaging-2024-08-30&tabs=HTTP#textnotificationcontent