Many of the REST API's make use of a pagination strategy for dealing with operations that can return a large number of items. This strategy is built around the notion of a continuationToken and a page size that determines the maximum number of items that can be returned in a single response. 

When a continuationToken is present in a response and has a non-null value, this signifies that there are more items available:

Example Request
GET /service/rest/v1/<api>?<query>
Example Response
  "items" : [
  "continuationToken" : "88491cd1d185dd136f143f20c4e7d50c"

The API that produced the response will take a continuationToken as an additional argument to the original query to signify that the next page of results is desired:

Example Request (next page)
GET /service/rest/v1/<api>?<query>&continuationToken=88491cd1d185dd136f143f20c4e7d50c

If this response also contains a non-null continuationToken, then its value can again be added to the original query to get the next page. This continues until the response returns a continuationToken with a value of null which signifies that there are no more pages of results.