To create Zendesk records from Mattermost without manual input, use a ready-made scenario.
Starts when: On new Zendesk ticket
Then: Get ticket
Then: Code
Check: IF
If yes: Create reply on existing thread
If no: Create thread
Then: Update ticket
Then: Configure
You can launch this Mattermost + Zendesk integration in Scriptera: describe the task in plain words — the scenario is built, launched and monitored for you.