Workflow action and model services-tasks-{task Id}-assignments

Number of APIs: 4

1. Delete assignments on a task

DELETE {{baseUrl}}/tasks/:taskId/assignments

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2. Get an assignments for a task

GET {{baseUrl}}/tasks/:taskId/assignments?includeUserIds=false&includeGroupIds=false

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3. Update an assignment on a task

PUT {{baseUrl}}/tasks/:taskId/assignments

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4. Create an assignment on a task

POST {{baseUrl}}/tasks/:taskId/assignments

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