Two separate contracts: One being an “Enterprise” license which you charge anywhere between $500-$5000/month. The other being a consulting agreement which the

Two separate contracts: One being an “Enterprise” license which you charge anywhere between $500-$5000/month. The other being a consulting agreement which they pay $X/hr for whatever number of hours the customizations will take. Make sure contractually you can resell any customizations to anyone else. And make sure you. And code-wise, make sure you organize their tweaks into modules which you can swap in and out.