Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Bypass
FP_FIELDCONDITION_BYPASS
Parameter: Combine Mode
FP_FIELDCONDITION_COMBINE_MODE
Parameter: Tolerance
FP_FIELDCONDITION_THRESHOLD
Parameter: Field
FP_FIELDCONDITION_FIELD