  Starting from the Mandelstam-Leibbrandt prescription, we introduce a general
rule for the null vector $\bar{n}$ to compute any $SIM(2)$ integral and diagram
with an arbitrary number of external legs. Using the new prescription, the
computation of the low energy limit of photon-photon scattering under the Very
Special Relativity (VSR) framework is presented. The prescription preserves
automatically the Ward identities corresponding to the gauge symmetry. Within
the low momentum approximation we get the standard unpolarized differential
cross section for photon-photon scattering. The result suggests that loops with
any external photon legs on-shell will be zero in VSR.
