% !TEX program = pdflatexmk
% !TEX parameter = -shell-escape
% Author: Izaak Neutelings (February 2023)
\documentclass[10pt,border=2pt]{standalone}
\usepackage{amsmath}
\usepackage{feynmp-auto}

\begin{document}

\fmfframe(0,15)(0,15){ % padding (LTRB)
\begin{fmffile}{feynman-compton}
  \begin{fmfgraph*}(110,80)
    \fmfleft{i1,i2}
    \fmfright{o1,o2}
    \fmflabel{$\gamma$}{i2}
    \fmflabel{$e^-$}{i1}
    \fmflabel{$\gamma$}{o1}
    \fmflabel{$e^-$}{o2}
    \fmf{photon}{i2,v2}
    \fmf{fermion}{i1,v1,v2,o2}
    \fmf{photon}{v1,o1}
  \end{fmfgraph*}
\end{fmffile}
}

\end{document}