Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Strength
HAIR_TOOL_CURL_STRENGTH
Parameter: Angle
HAIR_TOOL_CURL_ANGLE
Parameter: Tightness
HAIR_TOOL_CURL_TIGHTNESS
Parameter: X Height
HAIR_TOOL_CURL_AMP_X
Parameter: X Length
HAIR_TOOL_CURL_PERIOD_X
Parameter: Y Height
HAIR_TOOL_CURL_AMP_Y
Parameter: Y Length
HAIR_TOOL_CURL_PERIOD_Y
Parameter: X Curl
HAIR_TOOL_CURL_X
Parameter: Y Curl
HAIR_TOOL_CURL_Y
Parameter: Strength X
HAIR_TOOL_CURL_STRENGTH_X
Parameter: Strength Y
HAIR_TOOL_CURL_STRENGTH_Y
Parameter: Tighten
HAIR_TOOL_CURL_TIGHTEN