get https://chatapps.8x8.com/api/v1/subaccounts//messages/
This resource can be used to query message details like delivery status using the UMID of the message. You need to specify the sub account id and the umid of the message in place of {subAccountId} and {umid} respectively. umid is the unique identifier (in the form of a uuid) you received when you submitted the message to the api.
API Rate Limiting
To protect the platform from being overloaded and maintain a high quality of service to all customers, we enforce API rate limits for this API endpoint.
The limit is set to 1 request/second per subaccount.