[FredZarguna]

Photons are created in pairs during pair production, but unless there's some new physics that I didn't learn they're not always created in pairs. (There is no baryon number/lepton number that needs to be conserved...) The other conservation constraints (momentum, angular momentum, energy, whatever) don't require an additional photon. They can be conserved by changing the quantum numbers of the emitting or absorbing particle or guage.

[Boogieman]

Yes, I don’t think there is any requirement for photons to be created in pairs. Particles absorb and emit single photons all the time.