Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Mode
FP_SURFACEATTRACT_OBJECT_BEHAVIOUR
Parameter: Radius
FP_SURFACEATTRACT_OBJECT_RADIUS
Parameter: Attract Strength
FP_SURFACEATTRACT_OBJECT_STRENGTH_ATTRACT
Parameter: Follow Strength
FP_SURFACEATTRACT_OBJECT_STRENGTH_FOLLOW
Parameter: Damping
FP_SURFACEATTRACT_OBJECT_DAMPING
Parameter: Randomize
FP_SURFACEATTRACT_OBJECT_RANDOMIZE_TARGET
Parameter: Apply Object Velocity
FP_SURFACEATTRACT_OBJECT_APPLY_VELOCITY
Parameter: Object Velocity Strength
FP_SURFACEATTRACT_OBJECT_STRENGTH_APPLY_VELOCITY
Parameter: Align to Surface Rate
FP_SURFACEATTRACT_OBJECT_ALIGN_UP_TO_NORMAL
Parameter: Switch on Contact
FP_SURFACEATTRACT_OBJECT_CONTACTBEHAVIOUR_SWITCHGROUP
Parameter: Target Group
FP_SURFACEATTRACT_OBJECT_TARGET_GROUP
Parameter: Create Group
FP_SURFACEATTRACT_OBJECT_TARGET_GROUP_CREATE
Parameter: Mode
FP_SURFACEATTRACT_OBJECT_ELEMENTS_INEXMODE
Parameter: Simulation Tags
FP_SURFACEATTRACT_OBJECT_ELEMENTS
Parameter: Select Geometry to attract towards
FP_SURFACEATTRACT_OBJECT_SELECT_GEOMETRY