Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Texture
XNORM_SHADERLINKParameter: Strength
XNORM_STRENGTHParameter: Filter
XNORM_FILTERParameter: Invert
XNORM_INVERTParameter: Delta
XNORM_DELTAParameter: Clamp UV
XNORM_CLAMP_UV