Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Mode
FP_COLLIDE_OBJECT_BEHAVIOURParameter: Contact on
FP_COLLIDE_OBJECT_BEHAVIOUR_PROXIMITYParameter: Collision Iterations
FP_COLLIDE_OBJECT_COLLISION_ITERATIONSParameter: Radius
FP_COLLIDE_OBJECT_RADIUSParameter: Bounce
FP_COLLIDE_OBJECT_ELASTICITYParameter: Dynamic Friction
FP_COLLIDE_OBJECT_COLLISION_ANGLEParameter: Angle Variation
FP_COLLIDE_OBJECT_COLLISION_ANGLE_VARIATIONParameter: Switch on Contact
FP_COLLIDE_OBJECT_CONTACTBEHAVIOUR_SWITCHGROUPParameter: Target Group
FP_COLLIDE_OBJECT_TARGET_GROUPParameter: Create Group
FP_COLLIDE_OBJECT_TARGET_GROUP_CREATEParameter: Mode
FP_COLLIDE_OBJECT_ELEMENTS_INEXMODEParameter: Simulation Tags
FP_COLLIDE_OBJECT_ELEMENTSParameter: Select Colliding Geometry
FP_COLLIDE_OBJECT_SELECT_GEOMETRY