Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Use Collider
COLLIDER_USEParameter: Collision Shape
CONVEX_COLLIDERParameter: Geometry Accuracy
CONVEX_COLLIDER_CONVEXDECOMPOSITION_ACCURACYParameter: Bounce
COLLIDER_BOUNCEParameter: Friction
COLLIDER_FRICTIONParameter: Stick
COLLIDER_STICKINESSParameter: Collider Side
CLOTH_PBD_COLLIDER_SIDEParameter: Set
COLLIDER_SET_EXCLParameter: Clear
COLLIDER_CLEAR_EXCLParameter: Show
COLLIDER_SHOW_EXCLParameter: Draw
COLLIDER_DRAW_EXCL