Retrieve the details of a specific message template in your OneSignal app using its template ID. This API returns the template content, target channel, and timestamps for creation and last update.
app_id (query param): Your OneSignal App ID.template_id (path param): The unique ID of the template.template_id (UUID v4). You can find it:

Copy Template ID
Your OneSignal App ID in UUID v4 format. See Keys & IDs.
200
The template ID in UUID v4 format.
"Template-ID-in-UUID-v4-format"
An internal name you set to help organize and track Templates. Maximum 128 characters.
Options are: push, email, and SMS.
"push"
The date and time the template was created in ISO 8601 format.
"2023-07-20T19:16:55Z"
The date and time the template was last updated in ISO 8601 format.
"2023-07-20T19:16:55Z"
The template content.