Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Spline
MGSPLINEWRAPDEFORMER_SPLINE
Parameter: Rail
MGSPLINEWRAPDEFORMER_RAIL_SPLINE
Parameter: Axis
MGSPLINEWRAPDEFORMER_AXIS
Parameter: Strength
MGSPLINEWRAPDEFORMER_STRENGTH
Parameter: Offset
MGSPLINEWRAPDEFORMER_OFFSET
Parameter: From
MGSPLINEWRAPDEFORMER_FROM
Parameter: To
MGSPLINEWRAPDEFORMER_TO
Parameter: Mode
MGSPLINEWRAPDEFORMER_LENMODE
Parameter: End Mode
MGSPLINEWRAPDEFORMER_MODE
Parameter: Scale from Rail
MGSPLINEWRAPDEFORMER_RAIL_SCALE
Parameter: Size
MGSPLINEWRAPDEFORMER_SIZE
Parameter: Size Strength
MGSPLINEWRAPDEFORMER_SIZESTRN
Parameter: Spline Size
MGSPLINEWRAPDEFORMER_SPLINESIZE
Parameter: Spline Size Strength
MGSPLINEWRAPDEFORMER_SPLINESIZESTRN
Parameter: Rotation from Rail
MGSPLINEWRAPDEFORMER_RAIL_TARGET
Parameter: Up Vector
MGSPLINEWRAPDEFORMER_UPVECTOR
Parameter: Banking
MGSPLINEWRAPDEFORMER_BANK
Parameter: Rotation
MGSPLINEWRAPDEFORMER_ROTATE
Parameter: Rotation Strength
MGSPLINEWRAPDEFORMER_ROTSTRN
Parameter: Spline Rotation
MGSPLINEWRAPDEFORMER_SLINEROTATE
Parameter: Spline Rotation Strength
MGSPLINEWRAPDEFORMER_SPLINEROTSTRN
Parameter: Fix Bounding Box
MGSPLINEWRAPDEFORMER_FIXBB
Parameter: Bounding Box Center
MGSPLINEWRAPDEFORMER_BB_CENTER
Parameter: Bounding Box Size
MGSPLINEWRAPDEFORMER_BB_RADIUS