Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Draw
HAIR_CONSTRAINTS_TAG_DRAW_ANCHORParameter: Set
HAIR_CONSTRAINTS_TAG_SET_ANCHORParameter: Release
HAIR_CONSTRAINTS_TAG_RELEASE_ANCHORParameter: Clear
HAIR_CONSTRAINTS_TAG_CLEAR_ANCHORParameter: Object
HAIR_CONSTRAINTS_TAG_ANCHOR_LINKParameter: Influence
HAIR_CONSTRAINTS_TAG_STRENGTHParameter: Offset
HAIR_CONSTRAINTS_TAG_OFFSETParameter: Influence Map
HAIR_CONSTRAINTS_TAG_STRENGTH_LINKParameter: Offset Map
HAIR_CONSTRAINTS_TAG_OFFSET_LINK