put https://api.sama.com/v2/projects//tasks/.json
A task’s priority may be updated via the API with a request to a unique URL using the projectId, taskId and access_key. The priority field is an integer specifying the task’s new priority.
Tasks with lower priority values will be worked on first, and the default is 0. Range of value is between -2147483648 and 2147483647.
You can check current task priorities via the Get status of a set of tasks endpoint.