Filters for positions based on the specific platform

Filters for positions based on the specific participant.

Note: multiple participant codes can be provided in the query string, separated by ampersands.
E.g. participant_code=PLAT01&participant_code=PLAT02

Filter by account label (e.g., general, sub_account_test). Account labels are used to categorize accounts under a participant. Each participant account_label maintains a separate balance and transaction history.

HMAC-SHA256 signature of the request, base64-encoded. See the Authentication guide for the exact signing formula.

Current Unix timestamp in seconds. Must be within 60 seconds of server time or the request is rejected.