function readOnly(count){ }
Starting November 20, the site will be set to read-only. On December 4, 2023,
forum discussions will move to the Trailblazer Community.
+ Start a Discussion
shamlah veerashamlah veera 

messageDefinitionSends

Host: https://YOUR_SUBDOMAIN.rest.marketingcloudapis.com POST /messaging/v1/messageDefinitionSends/dfa5ab87-1b0f-e211-b71b-9c8e9920e9fc/send Content-Type: application/json Authorization: Bearer YOUR_ACCESS_TOKEN

What is the SendID that is mentioned in the above given URL? How do we obtain that from SFMC?
SandhyaSandhya (Salesforce Developers) 
Hi,

You may use 
Email Studio -> Interactions -> Triggered Sends
Use the value from "External Key" column

Refer below link.

https://salesforce.stackexchange.com/questions/199765/where-to-we-get-the-key-from-get-messaging-v1-messagedefinitionsends-keykey
 
Best Regards,
Sandhya