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Assuming that the underlying model satisfies some general requirements suchas renormalizability and CP conservation, we calculate the non-relativisticone-loop cross section for any self-conjugate dark matter particle annihilatinginto two photons. We accomplish this by carefully classifying all possibleone-loop diagrams and, from them, reading off the dark matter interactions withthe particles running in the loop. Our approach is general and leads to thesame results found in the literature for popular dark matter candidates such asthe neutralinos of the MSSM, minimal dark matter, inert Higgs and Kaluza-Kleindark matter.

General calculation of the cross section for dark matter annihilations into two photons