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For the process, $e^+e^- \rightarrow e^+e^-$ I know that the exchange particle is a photon and for the process $\gamma\gamma \rightarrow e^+e^-$, the exchange particle would be an electron but I'm not sure what charge this electron would have. I have no idea how someone would figure out what the exchange particles for a two-to-two process would be.

I'd really help any sort of guidance.

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    $\begingroup$ For that first one, charge should be conserved at every vertex $\endgroup$ – Triatticus Jan 17 at 12:52

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