/**
 * Segments::CreateSegment
 *
 *  Create a segment
 *
 *  segmentname     [string, required]: segment name
 *  ruleset         [object, required]: operator + list of rules
 *    op            [and|or, required]: rule combining operator
 *    rules         [array, required]: list of rules
 *      field       [string, required]: field name
 *      op          [string, required]: comparison/condition operator
 *      value       [string, required*]: comparison/condition value
 *  lists           [array, required]: list id(s)
 */
{
  "username": "bob", /* Email or username used for authentication */
  "usertoken": "123abc", /* API token for authentication */
  "requesttype": "Segments", 
  "requestmethod": "CreateSegment", 
  "details": {
    "segmentname": "{*segment_name*}", /* Name of the segment */
    "ruleset": {
      "op": "{*AND or OR*}", /* Logical operator for combining rules */
      "rules": [
         /* required: at least one */
        {
          "field": "{*field_name*}", /* Field to evaluate (e.g., \"email\", \"name\") */
          "op": "{*equals, starts_with, etc.*}", /* Condition to apply (refer to supported operators) */
          "value": "{*value_to_compare*}" /* Value to compare against */
        },
        /* ... Additional rules can be added here */
          /* ... use this for nested/grouped rules. */
        {
          "op": "{*AND or OR*}", /* Logical operator for nested rules */
          "rules": [
            /* ... Nested rules can be added here */
          ]
        }
      ]
    },
    "lists": [ /* required: at least one list.  */
      {*list_id1*},
      {*list_id2*},
      /* ... Additional list IDs can be added here */
    ]
  }
}