The Cursor represents a pointer to the next page of records in the pagination.
So this optional parameter, when filled, should be filled with the cursor string returned in a previous request to this end-point.
Filling this would basically tell the api to get the next page containing the number of records passed on the limit parameter.
On the other side not filling it tells the api you want to get the first page for another query.
The cursor does not store any filters, so if any filter parameters like settlement_status, ticker, or event_ticker were passed in the original query they must be passed again.

Restricts the positions to those with any of following fields with non-zero values, as a comma separated list.
The following values are accepted: position, total_traded, resting_order_count

Settlement status of the markets to return. Defaults to unsettled.
all SettlementStatusAll
settled SettlementStatusSettled
unsettled SettlementStatusUnsettled

Ticker of desired positions.

Event ticker of desired positions.