How Do I find out who the Contract/Section Leader on a Firm Order is?

Where the Leader information is stored will depend on what kind of risk it is as, and sometimes if you are a underwriter or broker. See below for all of the different variations

Single Section Open Market Leader

Will be displayed in the "leadUnderwriterChannel" of the control object of the RWPlacing document which can be retrieved using this endpoint Whitespace API on Swagger

Single Section Facility

Can be found in the "leadUnderwritercChannel" but if not ticked by broker when Facility was first shown, You can also check the RWLineGuidanceSet from this endpoint Whitespace API on Swagger, for the role “leader”

Single Section Declaration where the contract Leader is from a Facility

Check the "leadUnderwriterFacility" in the control object, this will be the ID of the facility where the leader is from. Then check the RWFacilityGuidance docs for this declaration, using Whitespace API on Swagger with a type of "RWFacilityGuidance" and search for the one with the matching FacilityID from the "leaderUnderwriterFacility" value. This will have information on who the leader is on this Facility.

Multi Section Open Market Leader

Check the RWMultiSectionStorer, using this call Whitespace API on Swagger with a type of "RWMultiSectionStorer" which will have the leader details for each section under "leadUnderwriterChannel".

Alternativley if you are an underwriter ( you won't have access to RWMultiSectionStorer) you can check the RWLineGuidanceSet and look at the "sections" array, if there is a leader in the section(s) that you are on, it will be shown there

Multi Section Declaration Leader

Check the "RWMultiSectionStorer" document for "leadUnderwriterFacility" and do the same again as you did for single section declaration leader. Alternativley for Underwriters you can check the RWLineGuidanceSet for the "leadUnderwriterFacility"

Multi Section Facility

Check "RWMultiSectionStorer" or lineGuidanceSet if former has no leader info. For Underwriter check RWLineGuidanceSet