public JSONAPIDocument<List<Pledge>> fetchPageOfPledges(String campaignId, int pageSize, String pageCursor) throws IOException {
    return fetchPageOfPledges(campaignId, pageSize, pageCursor, null);
  }
public JSONAPIDocument < List < Pledge > > fetchPageOfPledges ( String campaignId , int pageSize , String pageCursor ) throws IOException { return fetchPageOfPledges ( campaignId , pageSize , pageCursor , null ) ; }
Retrieve pledges for the specified campaign

@param campaignId id for campaign to retrieve
@param pageSize   how many pledges to return
@param pageCursor A cursor retreived from a previous API call, or null for the initial page.
See {@link #getNextCursorFromDocument(JSONAPIDocument)}
@return the page of pledges
@throws IOException Thrown when the GET request failed