Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Mode
FP_SURFACEATTRACT_OBJECT_BEHAVIOURParameter: Radius
FP_SURFACEATTRACT_OBJECT_RADIUSParameter: Strength
FP_SURFACEATTRACT_OBJECT_STRENGTHParameter: Damping
FP_SURFACEATTRACT_OBJECT_DAMPINGParameter: Randomize
FP_SURFACEATTRACT_OBJECT_RANDOMIZE_TARGETParameter: Apply Object Velocity
FP_SURFACEATTRACT_OBJECT_APPLY_VELOCITYParameter: Target Group
FP_SURFACEATTRACT_OBJECT_TARGET_GROUPParameter: Mode
FP_SURFACEATTRACT_OBJECT_ELEMENTS_INEXMODEParameter: Simulation Tags
FP_SURFACEATTRACT_OBJECT_ELEMENTSParameter: Select Considered Geometry
FP_SURFACEATTRACT_OBJECT_SELECT_GEOMETRY