Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Offset
MDATA_EXTRUDE_OFFSETParameter: Offset Variation
MDATA_EXTRUDE_VARIANCEParameter: Subdivision
MDATA_EXTRUDE_SUBDIVISIONParameter: Create N-gons
MDATA_EXTRUDE_CREATENGONSParameter: Preserve Groups
MDATA_EXTRUDE_PRESERVEGROUPSParameter: Create Caps
MDATA_EXTRUDE_CREATECAPSParameter: Maximum Angle
MDATA_EXTRUDE_ANGLEParameter: Rotation
MDATA_EXTRUDE_EDGEANGLEParameter: Quantize Rotation
MDATA_EXTRUDE_EDGESNAPParameter: Angle
MDATA_EXTRUDE_EDGESNAPVALUEParameter: Bevel
MDATA_EXTRUDE_BEVELParameter: Bevel Variation
MDATA_EXTRUDE_BEVEL_VARIANCE